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Old January 17, 2020, 02:19 PM   #8
44 AMP
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Join Date: March 11, 2006
Location: Upper US
Posts: 20,992
Ammo in the magazine does NOT get bullet setback. (the exception is with "elephant gun" class rifle rounds, where recoil can slam the bullets into the magazine wall with enough force to drive the bullet deeper in the case) This does NOT happen in handguns.

Setback, if it happens, happens during feeding from the magazine into the chamber.

The only possible issue swapping loaded magazines is when the slide is closed, A little more force is required to lock the mag in place because the top round is pressing on the slide. This is true with ALL box magazine fed arms. It takes a little more force to seat and lock a loaded magazine than it does an empty one.

As you as you ensure the magazine is properly locked in place, there is no issue.
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