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Semi-Auto Airsoft Gun Help

A place to ask general spud cannon related questions.
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Semi-Auto Airsoft Gun Help

Unread postAuthor: Vincente » Tue May 09, 2006 3:00 pm

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.
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Unread postAuthor: Rambo » Wed May 10, 2006 12:11 am

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.
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Unread postAuthor: shockwave » Wed May 10, 2006 1:29 pm

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 :P
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Unread postAuthor: Benny » Thu May 11, 2006 3:46 am

mabe hop-up, more air could be released from the valve before it fires.
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Unread postAuthor: Vincente » Sat May 13, 2006 8:10 am

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?
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Unread postAuthor: )DEMON( » Sun May 14, 2006 1:47 am

this is probley a stupid question,Whats hop-up? :?
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Unread postAuthor: FiveseveN » Sun May 14, 2006 4:28 am

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.
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Unread postAuthor: )DEMON( » Sun May 14, 2006 8:52 am

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