Pen Gun Questions?

Miniature guns are novelty custom, unique, and sometime downright crude! Common construction materials often include pill bottles or pens. Show us your work!
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jor2daje
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Thu Jul 22, 2010 2:24 pm

I dont see why you would ever use epoxy when you have the option to solder, its far quicker, easier, and stronger atleast when joining things that are meant to be soldered like brass tubes. (no offense jsr :D )
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Lockednloaded
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Thu Jul 22, 2010 2:24 pm

airsoft caliber, I think ~1/2" copper pipe chamber
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Mr.Sandman
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Thu Jul 22, 2010 2:55 pm

jor2daje wrote:I dont see why you would ever use epoxy when you have the option to solder, its far quicker, easier, and stronger atleast when joining things that are meant to be soldered like brass tubes. (no offense jsr :D )
Epoxy is by far easier than using solder. With solder, the parts have to fit a certain way, and if you don't have a metal piston, you cant solder the schrader. Plus with epoxy, if you make a mistake, you can wipe off the part with denatured alcohol and its good as new. With solder, you are't so lucky.

Back on topic, If you want to keep your barrel centered while the epoxy is drying, make a barrel spacer and glue it to you barell. Or you can do what I do and make a duct tape barrel spacer, they are cheap and effective.
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clemsonguy1125
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Thu Jul 22, 2010 3:26 pm

Just bought the parts for the gun, a rubber pencil eraser fits perfectly would it make a decent piston, Im worried about the barrel cutting into it.
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Gun Freak
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Thu Jul 22, 2010 3:59 pm

I don't think it will seal unless it is one of the really rubbery ones, also it might get cut by the barrel. Do they make rubber stoppers small enough for you?
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clemsonguy1125
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Thu Jul 22, 2010 4:07 pm

Nope, I wish I had some 1/4 inch thick rubber like JSR used, maybe Ill cast one like RC Mans from hot glue
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jackssmirkingrevenge
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Thu Jul 22, 2010 4:13 pm

you could also epoxy the seal to the barrel, and use a solid piston, along these lines:

Image
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clemsonguy1125
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Thu Jul 22, 2010 4:19 pm

I would but I cant find rubber tubing that small
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jackssmirkingrevenge
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Thu Jul 22, 2010 4:21 pm

... sharpen a section of barrel tubing and cut a hole through the eraser?
hectmarr wrote:You have to make many weapons, because this field is long and short life
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clemsonguy1125
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Thu Jul 22, 2010 4:22 pm

Thats what I had planned, wouldnt the barrel cut throught the eraser at 400PSI
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