So today I bought two crossman pump masters at Walmart for me n a friend and I opened mine up on the inside of the gun I found its operated by a hammer valve so here's what I wanna do I realized that when you pump it a few time and hit the valve pretty hard all the air comes out but when you tap it ...

Would that slide valve setup be able to shoot a .356 caliber object weighing 105 grains at 300 or more fps

Well I'm leaning towards making a semi auto .356 I want to either use a hammer valve or slide valve with a we've I would come up with some type of magazine assembly. what valve should I use to get a decent amount of power? The .356 weighs about 105 grains. is that to heavy? I would probably make a a...

Thanks I would like to design my gun to shoot a larger projectile than a .22 possibly a .357 or .25 or.45 I don't want to have an extremely complicated build though because I'm kinda new to all these valves and stuff I know decent amount of stuff though I would like to build something powerful eithe...

ok so i need help making a ball bearing gun or pellet gun i have made cloud bbmgs in the past along with air cannaons and a spud gun but i want to make a gun that shoots eother a 9mm size ball bearing or a .22 pellet either semi auto or bolt action but i want it to have alot of power but im having t...