Guys, I do not have the calipers .
I first noticed the issue when I tried to mount there burris tactical rings.
I could nt tighter them enough to stay in place so what I did was mount the rings on my sig556r and then on the hand guard rail on the AR and they fitted just fine.
Now that i think about it I did not buy the upper receiver. The smith had a bunch of em at the show on display with a lot of YHM stuff. I wish there was a way I could 100% confirm but I was certain it was YHM. Thgsi was last year so doubt he will remember.
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M.G
Kein Mitleid Für Die Mehrheit
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