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Old June 17, 2019, 01:24 AM   #24
Senior Member
Join Date: August 24, 2001
Location: LC, Ca
Posts: 1,906
Gun barrels are supposed to be reamed to the proper bore diameter before the rifling is cut.

Reamers and labor cost money. AMT probably skipped that step and went straight to the rifleing broach to save money.
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