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Old 10-08-2015, 09:58 PM
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Originally Posted by Test_Engineer View Post
Do all/most full autos use a counter weighted bolt like this?
No. Most machine guns are either closed bolt locked breech (e.g. M16), or open bolt blowback (e.g. Thompson, Mac/M11, Uzi).

The 10/22 kit is unique that is it closed bolt blowback operated. The weight in the bolt is designed to prevent the bolt from bouncing, by slamming into the bolt just after the bolt closes. This is to make sure the bolt is closed when the hammer comes forward. If the bolt is not closed, the hammer won't get a full/good strike.
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