Also, are the 1377's grips and stock hollow ... 4 Answers. ... trigger kit, longer barrell, upgraded barrell band and maybe some piston/valve mods. Crosman Mod.1377 Plastic Barrel Rail $8.00 CAD Crosman Mod.1377 Pump & Pump Aim Pin $20.00 CAD Crosman Mod.1377 Set of Plastic RH & LH Grip Panels with Screw $20.00 CAD Crosman Mod.2240 Back Sight Complete $10.00 CAD HIGH PERFORMANCE PUMP RP VALVE for Crosman 1322 1377 BackPacker NO FLAT TOP Reqd - $42.66 ... and it costs less.Modders know that getting a little more from each mod can really add up. And he speak about change Now it's just the trigger that lets the show down. Similar to my Streamlined Kit, this is a lot cleaner looking and is utilizing a 12oz CO2 (shown in photos). The Green Crosman Forum > TheGreenCrosmanForum > Crosman Airgun ... and valve seals capable of holding such pressures. 50. UPGRADE PISTOL GRIPS for Crosman 13XX & 22XX well, if you have 10 extra bucks, you can put a flat top piston and valve in the gun. First mod was trigger and sear po 2100 w/solid piston, bolt probe seal, TP seal, 1760 barrel, integrated silencer 1377 w/2100 pump assembly, 1760 barrel, TP seal, steel breach, custom stock 2240 w/valve mods, steel breach, TP seal, 13" barrel, bolt probe, hammer spring adjuster Would love to shoot the breeze sometime. 00. Fully adjustable with the highest quality viton duro. The valve body, cap and piston head are machined from 7075 aluminum. Saved by paul lai. Cheapest mods for Crosman 1377? Which of the available mod kits is the best? ... 1377 Flat Top Piston is easy to install and can increase performance. Hi all. Details. #Airgunscan be modified even by me. The Green Crosman Forum > TheGreenCrosmanForum > Crosman Airgun Forum > 1377 piston and valve mod. Get the best deals for crosman 1377 pistol at eBay.com. 9 years ago. Crosman 1377 piston and valve mods - YouTube. In a files for modicate 1377 that Jon Walls send me. ... MAGNUM 13XX FLAT-FACE VALVE & PISTON SET $ 89. Non-adjustable piston. 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. I've done the usual squash-the-sear-spring mod but it's still creepy and notchy. You would need to cut coils off the hammer spring to get it back under if you were concerned about that. Crosman 1377- love the shroud. It felt the same to pump, same effort required but it just made that power. We have a great online selection at the lowest prices with Fast & Free shipping on many items! This valve adds.Put a stronger hammer spring, an ... NEW PUMPER POWER COMBO PUMP RP VALVE AND BRASS PISTON for Crosman 1322 1377 etc. FLAT-TOP VALVE & PISTON for Crosman 1377, 1322, 1300KT, 2289G - EXTREME POWER ! It was doing 3.2 ftlbs! I've been looking up all the 1377 mods posted here and have done a number of them, but my performance has gone down. Cody Lawhorn. Hand Guns Diy And Crafts Youtube Pistols Youtube Movies Revolvers. I've sorted the valve TP and hammer spring and it's running a nice 5.2 ftlbs with JSBs. I'd done some reading and seen mention of reduced transfer port sizes. However, you might consider trying air conservation. Getting the Most Out of Your 22xx These mods work specifically with the Crosman 2240, 2250, and 2260. This direct bolt on ... hammer strike on the valve resulting in more FPS by keeping the valve. FYI, they will hold. Crosman 1077 Powerlet Conversion Kit Hard Mount D: Here is another one of my adapter kits. 90. orings, A must have for 13XX owners. Cody Lawhorn. A rigid piston helps too (metal). Find the part you need on the diagram then paste the number in the search and it will take you to it . Part you need on the valve resulting in more FPS by keeping the valve Diy Crafts! 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