SpudFiles

Front to back: Pen (barrel), 1/8" tee, 1/8" nipple, blowgun, 1/4" nipple, bottle cap, 2L soda bottle, tire valve. To shoot: the bottle is filled with air and the blowgun releases the air, pushing a BB from the barrel.

The ROF formula (muzzle-loaded) is # of PSI/2. (Ex. 60 PSI=30 shots)

The top of the tee can hold a grav-fed magazine.

How can I make this gun shoot harder/further??? BBs usually just plop out of the barrel.

I always thought that the only efficient homemade bb guns are the strafers.All other non full auto designs are with not better quality then a bb gun from the nearest shop.

Blowgun is a suckish valve for that purpose. It does not release the air fast enough. Maybe you should start from scratch and build a piston valve gun? It realy just took me two days to put one together including time spent searching for parts. The only exception is mine shoots marbles not bbs

mabe hop-up, more air could be released from the valve before it fires.

I don't have a good enough compressor for a strafer and I don't want to make a piston valve gun.

I want to keep the gun fairly simple so I think Benny's idea is the best.

How would I give this gun hopup?

this is probley a stupid question,Whats hop-up?

There is a small piece of rubber ar the muzzle. It applies friction to the upper side of the BB, giving it a backspin. That makes it curve upwards, thus giving it more range.
Would work on golf ball or marble spud guns, too.

oh,i knew what that was but i didnt know the terminology,thanks