I bought my LE 6920 brand new about a few weeks ago and I’m waiting for the weather to break to go shooting. I broke it down to clean out factory grease recently and I touched up a few nicks here and there with my birchwood and casey flat black pen, none of which concern me except for one nick I found in the threads inside the lower. My only concern is that this nick wasn’t created by the BCG or the buffer itself and that this nick also doesn’t interfere with the action of both parts (or any part). The pics are a bit blurry but you can see it underneath the left side of the buffer face. Let me know what you guys think.
It’s fine.
It’s not caused by the buffer, unless you’re being impatient trying trying to push the buffer retaining pin down with the charging handle and dragging the nose of that across there - probably just the upper bumping into it.
On the whole, that sort of internal cosmetic blemish is reeeeeeeally minor, and not reflective of any mechanical issue. Run a thousand rounds through the thing and you’ll be instantly overlooking little stuff like this - the 6920’s are top notch hammers, so don’t be afraid to put it to use.
Nope, I’m not messing with it at all. I should have been more clear, I was more concerned tha the BCG was hitting the threads on the lower. I really just took it apart to clean it a bit to get the factory grease out. The cosmetic nick doesn’t concern me, especially since it’s internal. It’s function is what matters to me.
Something would have to be way out of spec for the bcg to hit the threads and if that were the case you would know it as it would show on the front lip of the reciever extension. Since it is a 6920 that is highly unlikely.
It’s most likely from assembly. Don’t worry about it.
Assembly is what I was hoping for. Maybe a tool mark or something. In that case no biggie.