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Old April 15th, 2008, 19:37   #12
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Join Date: Jun 2002
Location: Toronto
Stock Marui M16A2 inner barrel is 6.08mm dia @ 509mm long.

Other readily available sizes on the market are 6.04mm, 6.03mm and 6.01mm.

At 509/510mm, you won't see a marked difference in velocity when tightening up the bore. Combine it with larger diameter quality BBs and you should see ~10fps increase.
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