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I stick to this break-in procedure with all new AR's:
If you have noticed, or tried it yourself, the bolt won't close all the way on a brand new, unfired weapon if you close the bolt slowly on an empty chamber. You have to finish closing it with the forward assist.
I consider the rifle "broken in" when the bolt will close slowly on an empty chamber without using the FA. This means you have no immediately obvious binding or misalignment issues. It also means everything has loosened up enough that the gun should run with any quality ammo.
Before going to the range the first time, and every subsequent range trip, I lube the bolt carrier group up generously.
For the first few hundred rounds, I use only new manufactured ammo of known quality.
I also use only tested and reliable magazines for the first few hundred rounds (and every time I test a new ammo type).
I started doing this test because it usually eliminates any "break-in" or "bad magazine" issues.
Normally, if you follow these steps a good, a top tier weapon will show you how reliable it is with certain ammo types without your having to second-guess if your gun was lubed properly or not, or if there was another issue.
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