The All New MRC/S2H Marshall Rifle Now Available

ODT

FNG
Joined
Aug 14, 2021
Messages
2
I don't think those markings are moving because the receiver is elongating, the axial load and temp are not high enough for creep to be a concern in steel. More likely, the threads are getting smoothed out a bit on the barrel tennon, allowing you to get more travel for the same torque.
 
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