making a gun
This animation should explain everything.http://www2.huntercourse.com/oregon/study?chapter=1&page=4 Also I highly recommend the iphone app, Gun disassembly, which is free and allows you to explore every part of a gun in 3D. FOH
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Bolt action chambering was the first and is still the most popular form of "chambering" a round. Chambering a round, as far as K'nex gunning goes, is when a round is loaded into the barrel separate from the magazine or wherever it was stored. This is done to give a repeater more range. Specifically, the bolt action chambering method uses a second "barrel" per se where the rounds load. A bolt is pulled back which has a bolt pin in the second barrel. This lets a round into it, and then it cocks the main barrel pin. When you push the bolt back, the bolt pin forces a round forward, up a ramp, and then into the barrel.http://knexinnovation.net/showthread.php?542-Zak-s-Bolt-Action-ZKAR-Follow-UpThat's probably the most popular example.