marbel barrel

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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xops007
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my friend and i finally made our first spud gun!! I don't have pics now bec i don't have a phone or a camera but he does and we will have pics very soon... anyway i want to make a barrel that shoots and holds marbles the best. If u can help that would be awsome.
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Hubb
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What size are your marbles?

(no pun intended :D )
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xops007
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umm i dont know.... but they are the ones that are glass and have a kinda swirly center.
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Hubb
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are they 1/2" (the small ones) or larger? The spud wiki has a lot of info on this. Maybe check it and see what it suggests (search for "barrel" and search for "marbles").
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xops007
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umm they are the 1/2 in... but i will look on wiki.
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