I went to the range the other day to test my freshly built AR15. When I got home I cleaned it and did a safety function check. That's when I noticed the bolt carrier shifting when dry firing.
Here's a video to demonstrate what I mean compared to another AR15. They're two separate BCM BCGs.
http://www.youtube.com/watch?v=G-m6GEnX98Q
Is this normal? I swapped the BCGs between the two rifles and narrowed it down to the upper receiver.


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