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5/31/2026 9:50:23 AM EDT
I have a pencil problem.  AR6720, R6001, now this.

Procured this upper Friday at AIM’s garage sale.  Yeah, it has a 1/2 moon bolt but everything else is normal.  Hand cut M4 ramps w/o finish, “4” stamp at the front (is this a leftover XM4 receiver?) and an A2 (800) elevation wheel with no Z.  Accurate Forge marked, skinny six hole H/Gs; I’m guessing 1992-Y2K ish.  No barrel date, just “O”

Any other ideas?

IMG_20260529_102549868_HDR by SmëgHead, on Flickr" />
IMG_20260529_121250354 by SmëgHead, on Flickr" />

IMG_20260529_121320742 by SmëgHead, on Flickr" />

IMG_6367 by SmëgHead, on Flickr" />
6/8/2026 12:31:19 PM EDT
[#1]
Is the front pin hole over sized or milspec?

it appears to be grey anodized?
6/8/2026 7:58:09 PM EDT
[#2]
Standard pivot pin hole.  The ano is gray / purple.
6/10/2026 12:19:03 AM EDT
[#3]
Don't worry pencil problems are common for middle aged men 😉
6/10/2026 9:38:06 AM EDT
[#4]
Good buy!

I think I snagged one without b/c in the $400 range many years ago. These are very nice uppers.

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