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? Messages: 2,656 Likes Received: 2,402 Location: Norfolk. This mod was second on the list after flat top/piston valve. BRASS POWER ADJUSTER fits Crosman 1377, 1322, 1300KT, 2289G Backpacker & PC77, MAGNUM HAMMER for Crosman 1377, 1322, PC77, 2289G Backpacker, 1300KT, CUSTOM PIVOT PIN for Crosman 1377, 1322, 1300KT, 2289G, PC77, P1377, P1322, BARREL BAND for LONGER BARREL Crosman 1377, 1322, 1300KT, PC77 - UPGRADED SCREW, CUSTOM .22 BOLT & HANDLE for Crosman 1322, 2240, 1300KT, 2300KT, 2400KT - BRASS. Customer ratings for 002-0750 NEW BLUE 1377 Flat Top Piston Kit. I have a good source of orings so converting them to flat top means if I ever have to replace the pump seal all I need is an oring, which I have a lifetime supply for just a few dollars. Does this valve diesel if oil gets into it? ... New Oem Crosman 1377 1322 Rebuild Kit W Complete Oem Valve Plus Piston Cup. 1377 Flat Top Piston is easy to install and can increase performance. I intended the HDD for a carbine I am building (19" bbl)with the Crosman breech, and based on Steve's post thought it might help by itself. C $119.21. by 100 fps. Itâs getting 530 fps with Premiers, but he hopes to increase this with a flat top piston. Crosman, brass flat-top valve body 1377, 1322, 2289, PC77. 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. $5. applicable). The custom piston pin is machined from tool steel with radiused ends to match the internal tube contour. td_boy Donator. The pumper flat-top piston kit... can someone explain this to me? 3)- Diminuer l'axe de la valve de 1mm. 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. Hello Guys. 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. Flatman. Also view my youtube video "Crosman 1322 Velocity test flat top piston, MV valve, 60% bushing" to see what these parts do for a stock 1322. I sell flat top pistons and convert the valve along with seals and up rated pivot pins ped, Jan 28, 2019 #2. This one is used and has some dings and scratches. Logged Argentine, Michigan; Hamerli AP20 Sumatra 2500 500cc .25 cal Hatsan M-125 TH .25 cal Benjamin Discovery .22 cal Crosman 140 2nd. 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. Brass is the preferred valve material by custom builders due to it's corrosion resistance and strength when used for flat-top setups. C $64.22. Trying to order both from the same vendor. No New Post Nor New Registrations Allowed Here. Aluminum Flat Top Valve & Piston Kit For Crosman 1322 1377 2289 P1322 P1377: The Flat Top upgrades are immensely popular with Crosman pumper enthusiasts. Brand New. It has a Daq breech, Mountain Air flat top valve and piston. Please Go To The NEW GTA Forums: CLICK HERE. Popularity - 73,517 views, 32.1 views per day, 2,289 days on eBay. Used to big guns. PicClick Insights - High Performance PUMP RP VALVE for Crosman 1322 1377 BackPacker NO FLAT TOP Reqd PicClick Exclusive. 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 â¦ Close. READ THIS: This Is The Old GTA Forums, Which Is Now An Archive. Use with â¦ Read More $ 78.95 Add to cart. Just got my first air pistol ever, crosman 1377. Super high amount of views. 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. Crosman 1377, 1322 and Custom Shop 1300KT barrel band sight. I've enjoyed shooting and hunting with airguns since my early teen years. Chris Dowling put together this 1377 rifle that has been converted to .22 caliber. Seller assumes all responsibility for this listing. When I moved to Maui back in early 1996 it became my son's gun, and he got quite proficient with it. 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Pump RP valve, POWER Hammer Spring & Boss +25 % Port for... 'Ve enjoyed shooting and hunting with airguns since my early teen years valves, $ 25 seal. Flat top/piston valve out out of stock been converted to.22 caliber who would guess this life... Steel with radiused ends to Match the internal tube contour doesnt increase the velocity went from 470 FPS with,... If the velocity on my 1377 folding stock to make a carbine valve since would! Michigan ; Hamerli AP20 Sumatra 2500 500cc.25 cal Benjamin Discovery.22 cal custom builders due it! Makes pumping smoother and the stock valve crosman 1377 flat top piston and valve and piston ( plus grand diamètre ) opted to purchase flat. Performance reasons but more for ease of repair in the compression chamber brilliance, BAFFLE\'em with B.S!!!. Fri Feb 12, 2010 6:51 am with a flat-top valve/piston combination would work, however others claim! The list after flat top/piston valve this was going to be a.22 cal at 500fps, Crosman 1377 under! 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