When the barrel is blueprints it gives a known start point and is cut to be timed correctly when turned onto the reciever.
take M1 garand, m1 carbines and 1903
the barrels are made so they time in correct to the design.
it will turn in the set it to top and you are done.
True on some they may be different due to tolerance stacking but most can be set by just a little work on the shoulder if needed.
MR. GADGET
NRA LIFE BENEFACTOR MEMBER
Rowan Artillery
N-SSA National Provost Guard
Just remember!
When a pot needs stirring, someone needs to do it...
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