I sell flat top pistons and convert the valve along with seals and up rated pivot pins ped, Jan 28, 2019 #2. Stock 1377's shoot in the mid 500's fps. Needed for Flat Top set ups. Crosman 2240 1377 1322 1399 Compatible Red Dot Mount Rail. td_boy Donator. New 002-0750 NEW BLUE 1377 Flat Top Piston Kit £ 36.00. plus delivery . For example if a stock 1377 takes 10 pumps to get 550 FPS you may be able to get the same 550 FPS on 7 pumps (or less) with the flattop setup. For additional information, see the Global Shipping Program. I guess it's shopping for another flat top piston. Big 22xx bulk C02 valves. $29.93 . Chris Dowling put together this 1377 rifle that has been converted to .22 caliber. Crosman 1377 1322 SuperPack Pump RP Valve, Power Hammer Spring & Boss +25% Port . ... NEW PUMPER POWER COMBO PUMP RP VALVE AND BRASS PISTON for Crosman 1322 1377 etc. This will probably be my last modification post on the 1322 until that valve and piston come in. I was wondering if it would be possible to adjust the piston so that it shoots 600 or 700fps with the same number of pumps (10) without retaining air, blowing seals, etc. I ordered a steel receiver from Crosman. Var Crosman … $32.88 + $3.00 shipping All the DIY needs to do is extract the cup, brass piece and aluminum washer and press the plastic piston head on in place of those parts. I didn't do it for performance reasons but more for ease of repair in the future. RE: Flat top valve and piston question for 1377 ?? + Update your shipping location 7 S 0 P O N S O A R P A 7 E E D-1-1 U J ... Flat Man's Pack Crosman 1322 1377 P1322 P1377 2289 Flat Top Valve Piston Spring. I've seen people say they can get pellet to fly 600-700 fps. Use with … Read More $ 78.95 Add to cart. Nice and flat with a fine finish. 568 sold, 5 available. Joined: Fri Feb 12, 2010 6:42 am Posts: 10 I was considering picking up a 2289 or a 1377 for some casual plinking, and was wondering if someone could tell me whether or not these two guns use the same valves? 1; 2 → Cart. UK ones always have had a blow by valve in 1322's originally had a square stem 1377's had a hole at the rear sometimes 180*s to the port later they just used the rear hole in the valve loads on line and on the crosman groups on how to fettle it you could just fit a ftp and valve … $14.95. 2)- Agrandit la chambre (plus grand diamètre). It has a Daq breech, Mountain Air flat top valve and piston. Used to big guns. From United States +C $13.25 shipping. Sent my stock 1377 valve to charles mellon and he modded it into a flat valve, I bought the Flat piston from the yellow classifieds (with a strange pin at the flat end, see pics) . That pump arm is locked solid at 3/4" and the flat-top setup but with the cup-type piston (factory setup) 3/4" seems about right. I think the flat top piston takes out the flex in the stock piston and the seal deforms less under pressure. Brass Custom Parts . Flatman. I like the look of the AC Custom piston but the valve is out out of stock. Solid brass flat-faced valve for use with a flat-top piston. Buy It Now. Close. This power combo greatly improves the power of the pumper guns by combining our extremely popular Pump RP valve that has been further flat topped on its face... and our NEW (Oct. 2016) solid BRASS non-adjustable flat top piston.Yes, you read that right. Page created in 0.303 seconds with 22 queries. More × MCAirguns. I just bought a 1377 with a flat top piston tuned to shoot .22 cal at 500fps. The guide and piston shaft are faithful copies from the Early Crosman adjustable piston from the 760 rifle.With the Modern guns Valve machined flat the same piston that is still in use in 40 year old guns can pump your 1322 or 1377. The weight of the piston makes pumping smoother and the gun is pumping 25-30% more air each stroke. by 100 fps. Now you can order them straight from the crosman custom shop with out the flat tops I built one up with a 24" barrel steel breach put a crosman stock on it flat top pistons and valve polished up the trigger bits tuned it tuned it tuned it most accurate gun I have ever owned. He grew and went on to centerfire rifles and shotguns so the 1377 went into disuse and storage. Hi Guys, I've just bought a brand new Crosman 1377 and noticed it's restricted to 495 FPS like the Canadian version. Reevo17 likes this. Back in 1984 I bought my new Crosman model 1377 pump pistol. Changed out all the plastic so its wood and metal only.Changed out the plastic piston and went with a brass piston that has a flat top with a modified valve assembly with a flat top.Replaced the trigger for an easier pull, topped off with a UTG 3x12x32mm scope, and custom grips. It flows better from the valve. I ordered a steel receiver from Crosman. Flat top valve and piston question for 1377 ?? Long before this website, there was a site all in yellow. $5. I converted almost all of my 13xx and 2289 to flat top. 13xx pump arm pin with clips to replace roll pin. I bought a 1377 at wally werld a while back and ordered a bunch of parts to customize it. Crosman, brass flat-top valve body 1377, 1322, 2289, PC77. by 100 fps. Brass end cap set for 22xx guns. 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 … Crosman P1377 American Classic Variable Pump Single Shot Air Pistol 177 Cal. At 10 pumps the flattop will give more FPS than the stock pump cup. I was wondering if it would be possible to adjust the piston so that it shoots 600 or 700fps with the same number of pumps (10) without retaining air, blowing seals, etc. The weight of the piston makes pumping smoother and the gun is pumping 25-30% more air each stroke. Login with username, password and session length. See our huge selection of gun parts for sale today. $17.88. It fits virtually every flat top piston Crosman ever made. J'ai procéder a une transformation de la puissance du Crosman 1377 C (4,5mm) comme suite: 1)- j'ai enlever 2 filets de filetage. Modding my Crosman 1377. For now I'm going with the front half of the 1400 valve (top) screwed to the rear half of the 1377 valve (middle). It’s getting 530 fps with Premiers, but he hopes to increase this with a flat top piston. With the flat-top piston, the distance had to be close as there is nothing to compress once you are metal-to-metal on the piston flat face to the matching surface of the valve. It has a 24″ barrel, lighter valve spring, angled and enlarged valve and barrel ports, reduced valve stem, and poly port. The flat top valve and piston will force more air per pump and more PSI of pressure into the valve. The "flat top" piston is really only a pumping efficiency modification and has nothing to do with valve potential energy... only less pumps. DOES NOT REQUIRE the flat top adjustable piston . This one is used and has some dings and scratches. This valve is a performance upgrade, but DOES NOT REQUIRE the flat top adjustable piston. Crosman 22xx series $65 ... 13xx custom Flat Top valves, $25. This translates into fewer pumps for the same FPS or more FPS for the same number of pumps. 90. orings, A must have for 13XX owners. i own a crosman 1377c multi-stroke pnuematic pistol. Posted by. Crosman 1322 1377 Pump Arm With Lever New Style Nice Upgrade . What is this designed to do?. build I would use the check valve and spring from the bottom valve since this would give me more volume. 002-0750 NEW BLUE 1377 Flat Top Piston Kit - gmac custom parts At 20 pumps, our customers report well over 100 additional fps in both .177 and .22 calibers.The flat top valve and the flat top non-adjustable piston makes each pumping stroke a little more efficient than the non-flat top setup. The stock valve assembly and piston. For example if a stock 1377 takes 10 pumps to get 550 FPS you may be able to get the same 550 FPS on 7 pumps (or less) with the flattop setup. Crosman 1377 … All Crosman 1377 1998-Present. You get more air into the valve per pump and less residual air in the compression chamber. 7 pumps will do the same as 10 pumps with the standard … 1377 flat top piston. Re: Flat top valve and piston question for 1377 ?. You will receive; One flat topped piston with two Viton o-rings, allen wrenches and instructions. Fully adjustable with the highest quality viton duro. The flat top valve and piston will force more air per pump and more PSI of pressure into the valve. Find many great new & used options and get the best deals for Flat Man's Pack Crosman 1322 1377 P1322 P1377 2289 Flat Top Valve Piston Spring at the best online prices at … in this video we give you the news on why your US full power valve is not as fast as it use to be, very interesting i must say Crosman-Benjamin Air Gun Gate (Moderators: Gertrude, longhunter, avator) » Who makes the best valve and flat top piston for a 1377? Crosman Barrel Band Screw For P1322 P1377 2289 Etc Pumpers With Longer Barrels. This translates into fewer pumps for the same FPS or more FPS for the same number of pumps. Fully adjustable with the highest quality viton duro. CUSTOM VALVE & PISTON for Crosman 1377, 1322, 1300KT, 2289G - EXTREME POWER !! This amount is subject to change until you make payment. I have read that getting a flat-top valve/piston combination would work, however others have claim it doesnt increase the velocity. FLAT TOP RP VALVE & BRASS FLAT TOP PISTON SET for Crosman 13XX PUMPERS $56.00 $56.00 Alchemy AirWerks Rally Ported Higher Performance Valve for 22xx Crosman CO2 Air Guns $49.00 $49.00 The High Performance PUMP RP VALVE $28.00 $28.00 Alchemy AirWerks Flat Top HP Valve … Alliance Hobby Flat Man's Pack All My Pumper Performance Mods for Crosman 1322 1377 2289 P1322 P1377: The Flat Man's Pack contains Pumper's Pack and the Flat Top Valve Kit. If you cant DAZZLE\'em with brilliance, BAFFLE\'em with B.S!! Something went wrong. This amount is subject to change until you make payment. It supplied me with Ringneck Doves for the dinner table as well as dispatching vermin like rats. This one is used and has some dings and scratches. Crosman 1377 for sale on eBay. Eradicator; Sharp Shooter; Posts: 584; Knoxville, TN; Who makes the best valve and flat top piston … If this was going to be a .22 cal. 4)- Casser l'angle de port d'échappement. This innovative combo is a drop in replacement for the stock valve and piston. Free P&P . If I understand this correctly, Only difference is between CDN and American version is that the Canadian version has modified valve to lessen the air volume. Posted: Fri Feb 12, 2010 6:51 am . #224 Riverside California 92504. u/Mike_ate_Sully. I am sure you will enlighten us all. accuracy is good at 10mts, velocity can be jacked up by pumping certain number of pumps into the valve. I got everything put together today. I am anxious for your theory. Super high amount of views. The valve body, cap and piston head are machined from 7075 aluminum. Notice the conical end of the valve body, and the conical seal on the piston. 1377 Custom Parts. Notice the very rough turning on the valve body! 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) The piston base is machined from black Delrin for ultra-smooth pumping and to function as a compression buffer to help protect metal parts from … I understand that the 1377 and 2289's are made with the aluminum valves, but was inquiring as to whether or not their CO2 counterparts (2240, etc) use the aluminum valves now as well. Facing the end of the valve intake end. Var Crosman 2200 Magnum 1st. It's also Black with a different handle & pump compared to the older models which were Brown. C $64.22. « previous next » Print; Pages: [1] Go Down Share This! Holds a little more air than the modern aluminum valves do. + Update your shipping location 7 S 0 P O N S O A R P A 7 E E D-1-1 U J-1 0 F J-1-1. I'm looking for ways to increase the velocity on my 1377. 1377 Flat Top Piston is easy to install and can increase performance. What is the difference between this setup and the stock Crosman setup? This makes this valve pretty much plug and play without that additional expense or adjusting hassle. Which for the most part you yourself had to mod and make yourself or send it to so.some. Before you go all the trouble and expense of a flat top piston etc. With standard valve stem $45. Introducing Solid Brass Piston With Crosman Cup For Crosman 1322 1377 2289 Etc . 3 pc set with cart end, rear tube and breech $45 per set. Save crosman 1377 valve to get e-mail alerts and updates on your eBay Feed. Brand New. 3 product ratings - Crosman 1377 1322 SuperPack Pump RP Valve, Power Hammer Spring & Boss +25% Port . READ THIS: This Is The Old GTA Forums, Which Is Now An Archive. Just got my first air pistol ever, crosman 1377. Flatman. I recently bought crosman 1377 Canadian version (495fps max) i was curious if I change into flat top piston/valve, will it make the gun strong as or more than stock American 1377? 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