in over 2,300 rounds I have had 3 failure to feed's, Never a Lock back just a failure to feed the next round. I attribute that to a break In period, In the last 600 rounds or so it hasn't happened. I'll shoot more tomorrow (at least another 200 rounds and see what happens

I also had a mag pop out 3 times while firing, But after changing out the mag release it has not happened again.