Originally Posted by
MSplumber
Maybe it's from hitting the feedramp, but some of the scraped copper got mashed up against the bolt face like you said earlier with brass. I guess it's not a big deal, I've just never seen that before and this is the first AR I haven't bought as a complete rifle so I'm wary about tolerance stacking. It was bought as a complete upper and a complete lower, though. Both BCM.
You wouldn't have posted the picture and asked the question if you weren't concerned.
Just to allay your concerns, if you bought the upper as a complete unit from BCM (used the add BCG option) just call BCM and ask if they check headspace before they ship the uppers.
If they didn't and you are still concerned, find a local gun shop/armorer to do it for you.
I'm with the others, though, in the opinion you needn't be concerned.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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