I just wanted to give a brief overview of my recent experience. Long story short I have a 16" midlength upper that was having initial issues of with failure to lock back on an empty mag, couldn't rule out the mags I was using or ammo. Went back once and then a second time with my BCM lower this time around, currently it is in the mail and fully functional. Ben with BCM called me directly after these issues and explained some of the testing that they had done that included full auto fire rounds per minute tests, a complete rebuild checking parts being in spec such as the gas port and bore sighting. He was also kind enough to chat and explain the cause of my issue (BAD Lever) and why this happens on some guns and not others. We also briefly chatted about my 14.5" upper and the KMR rail on it, and was interested in my experience with it and impressions of it.
He was very helpful and offered some interesting insights into how detail oriented BCM really is. I already knew BCM has a great reputation, but was more than impressed with my experience. Thank you Ben and BCM, fully confident in your products and a customer for life here!