As the title says. I hope I didn't miss another thread on this, searched and come up empty. Has anyone used the aim surplus lightweight nickel boron bolt carrier group in factory Ar, (specifically the colt 6920) ? Just wondering the long term effect and how the extensively used bcg would effect the m4 feed ramps. Or, in contrast, how the face of the bolt would or would not efface, and the performance of the ejector on said bcg. Loaded question, but was just musing this thought over in my mind. Thanks in advance for response.


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