WTS: AR-15 16" Carbine w/Specter length FF Rail - SPF
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03-25-2010, 7:43 PM
Join Date: Feb 2009
Location: San Diego (Mira Mesa), CA
Counter bored will look like a drill was used to remove about 3/8" - 1/2" of the rifling on the muzzle end. The Russians did it to fix a crown that was damaged from improper cleaning or other some other mishap.
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