First 100 shots all but 1 extracted, the 1 was left in the chamber. but every time it extracts, the brass comes straight back and hits brass deflector and falls to ground or bounces off to a 3 o'clock direction about 2 feet. Two new RRA bcg's in new rifles are doing the same thing. Changed buffer from standard RRA milspec m4 stock set, to custom heavy buffer, then to a H2 buffer. Both rifles do the same thing. both have blue inserts.
Just for note my RRA lower is too tight to my upper, my RRA bcg's seem to have weak extractors, my RRA m4 stock has poorly molded edges also... hmm quality control must have been laid off.
my third rifle was a del-ton kit with a BCM spring upgrade, flips 90 degrees with a distance of 10 feet. 100% reliability.