Might have been done to maintain a thick profile near the muzzle. Some thin barrels and especially tunny threads allow the bore to open up a little. Ideally you want the bore at the muzzle to be the tightest
Might have been done to maintain a thick profile near the muzzle. Some thin barrels and especially tunny threads allow the bore to open up a little. Ideally you want the bore at the muzzle to be the tightest
CNC Machining
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