Crosman 1377 Flat Top Piston And Valve 177 cal, 9gr pells and 8

Crosman 1377 Flat Top Piston And Valve 177 cal, 9gr pells and 8 pumps, I installed 24'' barrel, and I also installed a flat top valve and piston, The 700$ gun the other company has will do it, Shop with confidence, The valve is not exactly balanced in order to maintain a residual force keeping it shut, Since 1932, the Crosman brand has stood for high quality airguns, airgun ammunition, and CO 2 powerless that are affordable to our consumers, All the newer valves are aluminum and the 1377 and 2289 use the same unit, Note the flat top on the new valve, I will be making a pump head to match soon, This is what it looks like taken apart, note the balanced valve and separate eccentric check valve, 25 PLEASE NOTE For combined shipping, you MUST:1, Jun 26, 2012 · =DONT CLICK THE ADS, t, We have a great online selection at the lowest prices with Fast & Free shipping on many items! Alliance Hobby - Crosman 362 Flat Top Valve Kit - Piston Demonstration Alliance Hobby 1, I have tried Flat Top setups on my Crosman MSP's and while it does produce better than stock results, I have found that tuning out the cup piston setup produces even better results, Our piston is machined the exact correct length so that when used with our flat top valve it is always plug and play, 0 cc, Brass Alliance Hobby – Crosman 362 Flat Top Valve Kit – Piston Demonstration Alliance Hobby 1, enthusiast- turning down the valve face to work with the f, CUSTOM FLAT-TOP PISTON for Crosman 1377 1322 Drifter 1300KT 2289G PC77 760 M4177 - £35, The first mods I made on mine was the valve porting, replacing the plastic Apr 11, 2022 · Going to need a flat top piston and the works to get 760 fps using 14, Over time they started to loose power due to the hardening of the piston cup, We’re not just experts — we’re industry leaders with a long history of producing quality air guns, All the parts diagrams are available to download on Crosman, In the process of getting rid of that rolled steel sheet pump pivot pin, I pulled out the piston, Nov 8, 2022 · Crosman 1377 Trying to make my own Flat Top Valve and Piston #1 by R-Gun Pete » Tue Nov 08, 2022 8:08 pm Part 1 This is a different story, I have installed the new valve in two of my guns for evaluation purposes and they work fine, RESTOCK DATE NOT AVAILABLE YET - CUSTOM FLAT-FACE (aka flat-top) VALVE & PISTON KIT for Crosman 1377, 1322, 1300KT, Drifter, 2289G, PC77 $125, Here are the parts used in the testing documented above, Find top brands, exclusive offers, and unbeatable prices on , My 1322 carbine project with a 14, Not any more, Since the original is brass, I found a piece that I could use from my limited supply, Pump Cup Style is available with factory velocity or as a Power Valve This is a solid aluminum or brass piston for the Crosman 1377 1322 P1377 P1322 2289 & Drifter, I have now fitted the custom flat top valve and piston kit to the gun which arrived this morning, 00 or Best Offer Oct 16, 2025 · Up for sale is a Crosman valve assembly for 1377 and 1322 pistol and Crosman 362 rifle, The website hotrod Jan 24, 2024 · So I found a 1322 pistol I installed a flat top valve which I decided not to use and reinstalled the stock one, this was a while ago, FOR SALE! This is the Magnum flat-faced (AKA flat-top) adjustable piston and custom piston 125641167409 Jun 2, 2017 · My 1377 with flat top valve and piston did upper 500s with 7, I have the standard brass valve that ships with and is compatible with the 2240, 2250, 2250B, Ratcatcher, 2260 (and their , I am now making solid brass valves for the 1377 1322 P1377 P1322 2289 Drifter and 362, There are sharp edges and burrs inside that can cut o rings Apr 30, 2022 · I bought the Alchemy flat top piston/rp valve combo (valve came modified for the piston) it makes way more power but you have to pump over 10 to get it, I flat topped the valve, made a flat top piston, a pin to the piston to go into the transfer port to take up volume, added a valve retention screw, angled the exhaust port and trimmed the valve stem down in diameter (all of which can be done to the 13XX valve, same thing minus the front grip frame screw) and at 10 pumps it gets 750fps on , Crosman's first airguns were multi-pump pneumatics, which continue to be a mainstay of their product line in both rifles and pistols today, Dose anyone have a drawing for a flat top piston conversion on these, with this set up you will be able to pump up more air and gain more fps , Interested in the moderator we used? Checko Nov 9, 2025 · Plug & Play for Crosman Pumper, $22 3" Delrin brakes for 23xx, 22xx, Crossman and QB's Starting at $25 22xx, 23xx, 13xx, and QB muzzle brakes with O-rings in Delrin, aluminum, or brass Starting at $35 22xx, 23xx, and 13xx Check back more to come Cheers Nov 8, 2022 · The first step was to get all the dimensions from the existing valve and make a 3D CAD model of a flat top valve and piston, The Airgun Smiths Piston (brass piston) build has a valve I ported myself with lite valve spring , plastic transfer port, and a 18 inch barrel in 177, Nitro Piston-powered rifles like the Crosman F4 use a pressurized, nitrogen-filled gas piston to fire pellets, No adjustment required! Please read the blog on this innovative offering, We add new products often, so please add us as a favorite seller & return frequently, 760 Flat Top Kit Jun 9, 2016 · Custom Valve Piston For Crosman 1377 1322 1300kt Drifter 2289g Pc77 Custom Walnut Forearm Grips Fits Crosman 1377 C 1322 P Pistol Checkered Crosman 1377 1322 2240 2250 Lead Dust Collector All Long Barrel Lenghths Crosman 1377 Upgradedcustom 177 Steel Breech Tko Muzzle Brake Flat Top Piston Flat top really worth it? - Airguns & Guns Forum GTA » All Springer/NP/PCP Air Gun Discussion General » American/U, These things are worse than 10/22’s, i, Crosman Corporation is an international designer, manufacturer and marketer of Crosman pellet and BB rifles and pistols, Copperhead ammunition, high quality Benjamin pellet rifles and ammunition, airsoft rifles and pistols, and precision optics, Jul 19, 2019 · The most important part here is the adjustable flat top piston from Mac 1 Airguns, We have a great online selection at the lowest prices with Fast & Free shipping on many items! Mar 23, 2025 · Picked up this old American classic for 15 bucks the other day, It sounds like your exhaust valve may be leaking, this valve has also changed from a brass head with rubber insert to a teflon valve, The valve is not a modified Crosman valve, it's re-designed for maximum power and consistency and machined from 7075-T6 aluminum bar stock, Jul 16, 2020 · Author Topic: 1377 flat top piston and valve question (Read 3477 times)) Spooner Expert Posts: 1152 yes Real Name: Robert APRIL 2023 UPDATE x2: Adjustable Pistons now available, The valve-halves can be rotated to either side to align perfectly with the I’ve hot-rodded my Crosman 1322 into a muscle air carbine; I call it a Super Drifter #airgun, Crosman air rifles and pistols for sale online or in-store at Sportsman's Warehouse, So, the entire kit is the: Power Hammer Spring (part of the Pumper's Pack) Max Flow Exhaust Bushing (the other half of the Pumper's Pack) Flat Top Valve Flat Top Piston It is my complete performance kit for the Crosman pumpers available at a discounted price versus buying the parts Jul 12, 2025 · HIGH PERFORMANCE VALVE for Crosman 1322 1377 PC77 2289, 22 caliber considering the small valve size of 2, ) He's Met Bigfoot Since the 70s, Your dreams have come true, We have a great online selection at the lowest prices with Fast & Free shipping on many items! You need a flat top piston with a flat top valve, We have a great online selection at the lowest prices with Fast & Free shipping on many items! My 1377 is shooting just at 500fps with CPHP 7, Solid Wood Grips Crosman CO2 and Pumper Lines Checkered Wood Grips Checkered Slim Forearm (Crosman 1322, 1377, 2289) Alchemy AirWerks features stock, modified and custom items for Crosman air pistols, carbines and rifles, This is my problem and this is Jul 18, 2020 · Author Topic: 1377 flat top piston and valve question (Read 3434 times)) Get the best deals for Crosman 1377 American Classic Parts at eBay, You have your choice of a Pump Cup Piston or a Flat Top Piston, I do not have the breech parts at this time, We offer a wide variety of product for all skill sets including pump rifles and pistols, CO 2 rifles and pistols , and entry-level break barrel air rifles, CUSTOM FLAT-TOP VALVE & PISTON for Crosman 1377 1322 1300KT Drifter 2289G PC77: $144, 177-Cal Steel Breech Kit, Fits 1377, 1740, 1760 & PC77 Air Guns Crosman Benjamin Titan Piston Seal Crosman End seal 357/CO2 guns, See the update on my 1322, and where it is at today, below the parts list, I was good to go, Here's the new valve in brass compared to the old one in aluminium, Nov 7, 2024 · Good evening! I have a question about the Crosman 13xx I bought the valve and the flat top piston, and I'm not sure how many strokes it can handle, since the website doesn't specify, Put all items in one cart, GRIPS, I have a power valve for those same guns (more velocity and power per shot due to an enlarged air reservoir), INSTALLATION INSTRUCTIONS ARE POSTED FURTHER DOWN THIS PAGE, PLEASE READ THEM AS A GUIDE TO INSTALL AND ADJUST THESE PARTS The valve-halves can be Standard & Power Valves for Crosman 2240 2250 2260 Standard & Flat Top Valves for 1322 1377 2289 I offer various Crosman valves, I'm currently at 705 fps at 10 pumps with 8, Just what I needed…a new addiction, 00 This listing complies with \'s air gun guidelines found here and I will only sell Dec 11, 2013 · Regarding Crosman's pump cup and valve design, the common and prevailing thought is that they did it on purpose to create head space (extra air present in the gaps between the piston and valve, which would not go in the valve), Consider the Flat Man's Pack, which is the Flat Top Kit + Power Spring + Max Flow Bushing, I should mention that I also changed the transfer port and o-ring, I looked at the Mountain Air web site and found flat top pistons, Shop now for fast shipping and easy returns! Oct 26, 2025 · Explore top-quality ALCHEMY High Power PUMP RP VALVE for Crosman 1322 1377 Drifter, everything is working fine, no leaks or residual air from pumping, This is the next video in the epic series "The Great Crosman Build" in which I show the difference between the flat top piston and stock piston and valve, Mountain Air bolt and probe, Blue fork Barrel band, TKO shroud, Crosman 24″ barrel, Muzzle mac stainless steel screw kit, Muzzle mac wire stock, RB laminate grips, Air gun Smith trigger, Mountain Air trigger guide and spring, Barska scope, and BKL mounts, 4gr JSB Exacts, If you dont have one, you can use your stock valve but needs to be flat top, 177, Alliance Hobby - Flat Top Valve Install for Crosman 1377 1322 2289 P1377 P1322 Alliance Hobby 1K subscribers Subscribed Mar 2, 2025 · Find many great new & used options and get the best deals for Crosman 1322 1377 2289 Complete Rebuild Kit New Piston , Valve & Transfer Port at the best online prices at eBay! Free shipping for many products! Jan 31, 2015 · Here are the mods I'm planning to do: - flat top piston/valve - extended probe - steel breach - 18" barrel - metal barrel band - stainless steel pivot pin - brass safety - adjustable trigger - trigger shoe - wire stock with adapter to replace the crosman stock - wooden grips and pump arm Find many great new & used options and get the best deals for OEM Crosman 1377 1322 Valve Plus Piston Cup at the best online prices at eBay! Free shipping for many products! Crosman 1322,1377, 2289 Aluminum Flat Top Piston, MV Valve, 60% Bushing Combo $159, Non-adjustable piston, You need a flat top piston with a flat top valve, com customer services, the valves are all available from S D customdesign, Brass available in Flat Top Style, This tactical BB gun delivers an exciting backyard shooting experience with its blistering rate of fire and realistic feel, Benjamin Marauder rifles and pistols, 21 to 24 inch barrel may not gain hardly anything in , can do that by grinding, filling or sanding the tip of the valve to make it flat, Crosman recently made this change, they threaded the pump tube instead of the valve, Questions and parts requests encouraged, I put in a transfer port with higher airflow, I may fire up the lathe and make one if I can find a Get the best deals for Crosman 140 Valve at eBay, Shop a full selection Crosman air guns at the best prices, Get the best deals for Vintage Crosman 1322 Medalist at eBay, Perfect for enhancing your air gun experience, made in the USA, I can tell you a flat top piston 1322 with 20 degree angle drilled exhaust port opened to 5/32" , softer valve spring, and an 18" barrel will work very well, You can do an adjustable piston with a stock seal and valve (cone shape), but the flat top with o-ring seal reduces headspace, thus increasing compression per stroke, 177 Steel Breech, TKO Muzzle Brake, Flat Top Piston Pre-Owned $160, Feb 1, 2021 · A scoped Crosman 1322 with a steel breech, and valve mod, ADJUSTABLE BRASS & ALUMINUM PISTONS FOR CROSMAN 1377 1322 P1377 P1322 2289 DRIFTER 362 Here is the tuner's and modder's delight, I have a Crosman 1377 and a 2289 that were bought in the Summer of 1999, About this item 2289 Crosman ALCHEMY AIRWERKS FLAT TOP HP VALVE & BRASS FLAT TOP PISTON For Crosman 1322 Etc, Nov 13, 2025 · Explore ALCHEMY AIRWERKS for improved Crosman 1322 performance, For now I'm going with the front half of the 1400 valve (top) screwed to the rear half of the 1377 valve (middle), What It Told Him About Humans Will Shock You! – Sasquatch Story Jan 11, 2009 · A flat top piston will increase efficiency (reduce the pumping), and increase power to a certain extent, Some fresh seals and a quick printed ldc and it is a great shooting pistol, 3 crosman pellets, We are the only company in the world producing a completely-custom re-engineered valve for these models, Some of it can be handled by the d, Visit us at WWW, Here is a chart showing the difference between a stock 1377, one with an adjustable aluminum piston but stock pump cup, and a flat-topped version, 22 , 09K subscribers I recall something like 10fps per inch is typical and also ( could be wrong ) anything much past 20 inches gains are less without valve breathing mods, Flat top piston/valve for 1377 Anyone used the alliance hobby FT piston/valve? Considering it since I can get it bundled with other things I’m looking for Find many great new & used options and get the best deals for Flat Top Valve & Piston for Crosman 1377 1322 1300KT 2289G PC77 Adj, If you're interested in replacing as much plastic as possible while retaining the reliable rubber pump cup and OEM performance, then this is the piston you need, Going from a 10" barrel to 24" gained me 80 fps, so going from 10 to 14" barrel isn't going to make much difference, I think , 60 shipping I have seal kits for the 1377 / 1322, but if you have the older "rear cocking knob" guns, ONLY the valve parts will fit, PROBLEM SOLVED! NEW Custom High Performance PUMPER POWER COMBO, Air Gun Gates » Crosman-Benjamin Air Gun Gate » Jun 21, 2025 · Note: The new Crosman valve has a groove instead of a mounting hole, Mods: Ported valve, tubing breech seal, flat-top, stock volume valve and o-ring nylon piston, light valve spring, longer hammer spring with spring guide, polished hammer and trigger with lighter spring, Shop our exclusive flat top HP valve & brass piston combo, made in the USA, Also show how to deburr the tube to prep Aug 6, 2019 · I was still getting partial valve lock though, Tha plastic POC has to go! So the question ('s), COM for items not eBay listed, For nearly a century, Crosman has been supplying air rifles, air pistols, and more to people who appreciate the simple joy of shooting, We have a great online selection at the lowest prices with Fast & Free shipping on many items! Al responds to viewers questions about the easiest and last costly way to increase Crosman 1377 power for hunting, This technology allows a shooter to keep their weapon cocked for long stretches of time (unlike most air guns), and also to shoot with less noise and reduced recoil, I recently converted my Crosman 1377 into a 1322, Oct 14, 2007 · The flat top piston works best with a flat top (modified) valve, We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jun 1, 2012 · I recently bought and installed a flat top piston for my Crosman 1322, it works as advertised; less pumps for the same velocity, Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network, dual CO2 cartridge rifles introduced in 1955 were perhaps the most famous of all the CO2 rifles made by Crosman in what has been called the Golden Age of CO2 rifles, But they also sell flat top valves, com, Get the best deals for Crosman American Classic 1377 Parts at eBay, It only takes a few minutes to make one, so why not, Crosman was incorporated in 1924 as Crosman Rifle Company, Also has a felt oiler to keep things smooth adding the flat top piston and valve makes it a little HARDER to pump Physically, Dec 5, 2025 · For Crosman 1322 1377 PC77 2289 P1322 P1377, Both styles feature valve improvements such as angled exhaust ports and polishing, #drifter In this video I installed a custom flat-top piston and valve kit, a metal breech, an Power Valve, Power Spring, Bored Bushings Adjustable & Static Brass & Aluminum Pump Cup Pistons For 1377 1322 2289 Drifter Flat Top Valve & Piston Kits Power Valve, Power Spring, Bored Bushings Crosman SOLID BRASS Main Tubes Piercing Stems (CO2 Caps) Solid Brass End Caps (Piercing Stems & Hammer Covers) Crosman SMOOTH Main Tubes Crosman Main When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission, Oh yeah don’t forget to smooth out your inner tube that holds the piston and valve, Oct 4, 2024 · I have a Crosman 1377 on the way from Airgun Depot, They can make pretty good power compared to the 1377c valve and piston, Infinitely adjustable via jam nut and set screws, Jun 27, 2012 · My own experience with these mods, as I have this FT & flat ported valve setup with a 24" barrel, and my gun shoots +200 fps over stock, Crosman air rifles offer the best in class rifles through their precision, style, and functional designs, 00 Get the best deals for Crosman 150 Valve at eBay, Buy ALCHEMY AIRWERKS FLAT TOP HP VALVE & BRASS FLAT TOP PISTON for Crosman 1322 etc, Jun 14, 2010 · It has a Daq breech, Mountain Air flat top valve and piston, the truth is I just cant tell a difference between this upgraded 1377 and my normal one? Jun 14, 2008 · The long inlet valve you describe is a direct replacement for the short plastic valve and aluminium spacer, If velocity is what you are after, the combination of a longer barrel, and a flat top piston would be the way to go, Find top brands, exclusive offers, and unbeatable prices on eBay, Founded in 1923, Crosman has been a leader in the air rifle industry for almost a century, pellets, Fits: 2240 2250 2260 1377 1322 2289 Flat Man's Pack (Flat Top Valve & Piston, Power Spring, Max Flow Bushing) Fits: 1377 1322 P1377 P1322 2289 362 Performance Pack (CO 2 Valve, Spring, Max Flow, Adjustable Sear) Fits: 2240 2250 Rifleman's Pack (2260 only (CO 2 Valve, Spring, Max Flow, Trigger)) Fits: 2260 Professional's Pack (Expensive! Check back more to comeCheers Oct 24, 2012 · If you order the flat top piston and valve combo is does everything in one shot, just check the transfer port size while you have it apart, Crosman air rifles come in a variety of shapes and styles to suit every kind of shooter, All very reasonably priced, valve and flat top piston is 30 bucks for example, Nov 25, 2025 · The valve is not a modified Crosman valve, it's re-designed for maximum power and consistency and machined from 7075-T6 aluminum bar stock, is pretty straight-forward stuff, In summation I think it is time for me to reconsider using the Flat top piston, Crosman 66 Modding, Most folks seem to recommend a flat top piston, Available in standard pump cup style or as part of a Flat Top Kit, See the close-up pictures, Crosman, Crosman 1701 adjustable sear spring, Disco hammer spring, Boss Buddy transfer port, First, we put it on the mill and angle the exhaust so the escaping air doesn't have to make a hard 90° exit, Get the best deals for Crosman 357 Valve at eBay, 22 caliber/ M167 , Break barrels are great for backyard plinking and target practice, while PCPs (pre-charged pneumatics) are great for hunting, When installing just use a little grease on the arch to keep it from moving when you slide the valve down the pump tube, 3gr, (never break a valve stem again) Also Crosman 22xx, 23xx guns, The flat top piston and valve combination is far more efficient at compressing air than the stock piston and valve (less pumping to reach a desired velocity), , Air guns, Airgun Forum@rangerfredbob: Nice results from your Recruit, We have a great online selection at the lowest prices with Fast & Free shipping on many items! Feb 11, 2025 · Charles Mellon makes valves, flat top pistons, pump arm goodies, all sorts of stuff, About this product item 1 Flat Top Valve & Piston for Crosman 1377 1322 1300KT 2289G PC77 Adj, Feb 20, 2024 · The Crosman Model 160 Pellgun , Crosman CO2 Valve Theory Of Operation & Modification For Increased Power (Part 1, I ordered a flat top piston and valve from Peter Nollan on eBay, Oct 22, 2013 · Anyway, the Powermaster 66 tube is a little longer than a 760 tube, and with the linkage you will get a little more stroke, top that off with a flat top piston and valve and you have a nice little combo The key feature of flat-topping the piston and valve in a pumper is to reduce the "headspace" (dead volume) between the piston and valve, from only $96, Sep 2, 2008 · Friends, The saga of modding my 1377 continues, Make it more backyard friendly, Get the best deals for Crosman 1377 Valve at eBay, At checkout, leave the message Jun 22, 2025 · Browse all new and used Ruger Revolvers – Blackhawk for sale and buy with confidence from Guns International, S, NEW OEM Crosman 1377 1322 Rebuild Kit w/ COMPLETE OEM VALVE Crosman PC77 1322 1377 2289 Seal Kit - Bolt/Valve Seals, Valve Stem & Pump Cup, New valve and piston At this point I replaced the valve and piston, I have supplied a sst sleeved lock screw and a sst semicircle arch that allows the valve to be mounted in guns with the older valve that has the threaded mounting hole, I cut the thread with a die and checked the fit again the existing one, Should I go back to the flat top valve in order to make the gun work again? Get the best deals for Crosman 1377 Barrel Band at eBay, It does not require the flat top adjustable piston upgrade, The steel breech kit arrived today, and a flat-top piston and valve kit, walnut grips, metal barrel band and clevis-style pump arm pin are on the way, Featured items CUSTOM VALVE & PISTON for Crosman 1377 1322 1300KT Drifter 2289G PC77 $134, You are bidding on Delrin adjustable flat top piston for crosman 1377, The "flat top" piston is really only a pumping efficiency modification and has nothing to do with valve potential energy, The Flat Top Valve is an OEM Crosman valve that has been heavily modified, 95 + $2, Jan 19, 2018 · Crosman brings the heat with the DPMS SBR Full-Auto BB Air Rifle, These mods WILL make a 1377 PAL rated! You would need to cut coils off the hammer spring to get it back under if you were concerned about that, Delrin valve stems for bulk Co2, PCP, and HPA air guns, 6" barrel is in the high 590s low 600s on 12 pumps with 14, 3 gr, SKIP THE ADS! Thanks= PART 2 of the Crosman 1377 Rifle Conversion Project, BRASS CUPPED PISTON AND PUMP RP VALVE SETS are extremely popular, I've had this Crosman 1377 since the early 80's, but quit shooting it since it needed I decided to try my luck at Nov 8, 2022 · The first step was to get all the dimensions from the existing valve and make a 3D CAD model of a flat top valve and piston, We are the only company in the world producing a completely custom re-engineered valve for these models, | #3888631169 Crosman 2240 Power Adjuster Explore a wide range of our Crosman 1322 Upgrades selection, With 16 Pumps and 7, 25 will go less than , Replacing the front half with the 1400 valve will make it easier to go with a flat top piston on the pump, Sep 24, 2021 · The RP Valve is a great alternative to a more expensive flat-top piston mod, which only improves pumping efficiency over the power increase provided by Pump RP Valve, but if you are feeling spendy, or just really want the increased pumping efficiency, Buy the AlchemyAirWerks Pump RP Valve SuperPack Step 4: Add Optics Redirecting Redirecting Feb 23, 2025 · Here is a custom flat top valve and piston set for Crosman 1322 1377 2289G drifter 1300kt pc77 the valve is made of brass and the piston is steel brass and aluminum the piston is adjustable, Caution! Also uses Jun 21, 2025 · The valve is the same except for the groove, Fully adjustable solid brass and aluminum pistons for the pump line, Stainless Steel Roll Pin Replacement for Crosman 1322 1377 / PC77 Backpacker 760 NOW PHILLIPS HEAD! $14, Find great deals on eBay for Crosman 1377 Valve, Feb 25, 2018 · Drop in power upgrades to get high velocities from a 10" Crosman 1322 pump pistol, RP VALVE ASSEMBLY AND BRASS PISTON WITH CUP, American valves? #3 by AirGunEric » Fri Feb 12, 2010 9:32 am The brass valves have not been used for a number of years and are long discontinued (although a couple might be floating around in someone's inventory ), Crosman Corporation is an American designer, manufacturer and supplier of shooting sport products, with a long-standing presence in airgun design and a tradition of producing pellet and BB guns, 177 goes further in cardboard because of its size , same as , BRASS, Stacking premiers at 5 yards, This custom part greatly improves the power of the pumper guns by both increasing the available space to build pressure with each stroke, Brass Flat Top Piston and Pump RP Flat Top Valve Sets are unleashed! Plug and Play, All other parts don’t really matter which company you buy them from, Oct 21, 2019 · Hi my 1322 has A Lot of mods, ie adjustable flat top piston , internal valve smoothing and added volume, poly tube transfer port with an rj machine long riser b SOLID BRASS 1377 1322 362 2289 VALVE While Crosman makes the 2240 2250 2260 valve in brass, if you have a pumper, all you get is poorly machined aluminum, At 550+ it make the gun pretty flat shooting at close ranges (15-25yds) The gun is totally set up for 15 Feb 12, 2010 · Re: Crosman 2289 and 1377 valves, AND is ported internally for more efficient transfer of that air to the barrel port, 95, Nov 8, 2022 · The first step was to get all the dimensions from the existing valve and make a 3D CAD model of a flat top valve and piston, Alliance Hobby - Flat Top Valve Install for Crosman 1377 1322 2289 P1377 P1322 Crosman model 1377 trigger improvements also good for model 1322, We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jul 9, 2025 · This modification to your valve gives excellent results on Crosman 1377 and 1322 pump action air guns, Do I need both? Or will the flat top piston work The stuffed piston has the same advantages as the adjustable metal cup seal piston, Jan 17, 2011 · Before you start modding your 1377 take plenty of time to do searches of this forum for pros and cons of each new modification, ALCHEMYAIRWERKS, 2, meaning, each pump pumps MORE air per stroke, thus more resistance per stroke, 09K subscribers Subscribed Crosman 1377 UpgradedCustom , Dial in whatever setting you want, for whatever ADJUSTABLE PISTON PACK FOR CROSMAN 1377 1322 P1377 P1322 2289 DRIFTER 362 This kit consists of my Normal or Flat Top Valve, Adjustable Piston, Power Spring and Max Flow Bushing, y, They use urethane o rings and a plastic pump head that compresses more air into the valve, Jan 18, 2015 · Valves are all the same basic design, 177 variants), only maybe one less pump after thirty! Nov 27, 2021 · Both have the same parts, Alchemy Airwerks, plug & play flat top piston and flat top valve, Aluminum available in both Pump Cup style and Flat Top Style, I'm fixing to add a 12 inch barrel from Charles Mellon and a LDC from Geo Schoonmaker to the 1377, Brass at the best online prices at eBay! Free shipping for many products! Explore a wide range of our Crosman 1377 Rebuild selection, 9 gn pellet I got velocitys between 690-700 fps, I noticed the gun feels weird when I cock and pump it, I would love it to shoot 550+ just for a bit more energy increase and to flatten out the trajectory at the close range I'm shooting, 8 pumps is the most I want to spend pumping the gun up, I would really like to use 6, I am posting this because people have asked about my 1322 upgrades, and the air gun used in this video, My best results have been with a home made adjustable aluminum cup piston, though stuffing the piston gets quite close to Aug 4, 2020 · ok, so the flat top piston/valve and Max Flow transfer port, An excellent example would be the flat top piston mod, as I understand it when you do this as well as flattening the end of the valve more pumps are required, and more maintenance on your part, There's a lot of info on the green Jul 6, 2024 · Anyone know where to buy flat top pistons and valves for a crosman 1377 in the UK, 362 Flat Man's Kit Jun 5, 2021 · The piston is also a bit longer and the valve cone is reshaped to fit the pump cup better, In this case, I bought it from Mellon Air, very good products, but how far can I go? Oct 29, 2012 · i have a brand new crosman 1377 its the canadian version im putting on a steel breech and scope whats my best option to get the most power and accuracy? i was thinking flat top piston and valve and an 18 inch barrell any suggestion? can i run an 18 inch barell on a stock 1377 Not sure your thoughts on the cone having more surface area being better, more surface area and higher compressability of the piston material makes for a less efficient pumping process, but for 10-15 pumps max if you shim the stock piston and shape the nose of the valve to fit the pump cup there is little difference compared to a flat top setup, I believe that I will begin using the adjustable flat top piston in all of my Crosman AirGuns from now on, I had not tried a custom valve and piston before and decided this would be a good opportunity to see what difference they make in the guns performance, Dial in whatever setting you want, for whatever SOLID, Not finding what you're looking for?Save crosman parts 1377 to get e-mail alerts and updates on your eBay Feed, After that, we straighten up the exhaust hole with a nice six-fluted bit, 00 ADJUSTABLE BRASS & ALUMINUM PISTONS FOR CROSMAN 1377 1322 P1377 P1322 2289 DRIFTER 362 Here is the tuner's and modder's delight, I couldn't tell any difference from stock at 10 pumps but I don't have a chrony to test, I have a few valves to choose from, Only valve mod was to smooth out the 90 degree angle in the exhaust port, Brass Flat Top Valve & Piston for Crosman 1377 1322 1300KT 2289G PC77 Adj, Attention Ebay: This is a pellet gun part, I also changed the hammer spring to a higher tension one and I changed as well the trigger spring to one with a two pound pull, p, You have to used a flat top valve, 00 Out of Stock Quantity The valve is not a modified Crosman valve, it's re-designed for maximum power and consistency and machined from 7075-T6 aluminum bar stock, REALLY NO NEED FOR FLAT TOP! Opened the Videos page with the first How-To video of many to come, This is the Magnum Airpower FLAT-FACE (AKA FLAT-TOP) VALVE & PISTON KIT, This is the parts list minus my own modifications for the 1322 used to take pests and small game, Yes, you read that right,