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Old 03-29-2021, 12:09 AM
GMTECH485 GMTECH485 is offline
 
Join Date: Nov 2009
Location: Tacoma, Washington
Posts: 113
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The M1/M14 barrel has a convex shoulder that actually compresses when it is tourqed down.
It is there to keep the barrel tight.

Rolling the shoulder back on a used barrel is an acceptable process and will not effect the headspace at TDC as the convex shoulder will compress as it is tightened
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