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Old July 3, 2009, 03:30 AM   #6
Bud Helms
Join Date: December 31, 1999
Location: Middle Georgia
Posts: 13,076
An over-barrel silencer will affect fps. You will generally gain velocity (due to free-bore) and accuracy.
Free bore is at the other end of the barrel, the chamber end. It usually increases velocity, but accuracy is gun-to-gun.

There's nothing in your list about running free bore out at the chamber end. Is that what you mean?
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