Maybe my vast horde of loyal followers (all 3 of you) can help me out with an answer to this question. What is the deal with that 1 inch skinny section near the muzzle of AR barrels? The little dealie up there?
It’s beyond the gas system, so it isn’t part of that. It’s not like any other part of a bayonet lug that I ever saw or heard of. It didn’t show up on older M16s, so it is a relatively new development. It’s not ubiquitous, and I see it mostly on M4s and M4geries, but it is pretty common. Heck, maybe it’s ONLY on M4 types.
I just can’t fathom its purpose on my own.
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