Or is it like the RFB, adjustable. I just about ready to shed the RFB for a DPMS AR10 and a SU-16 in a trade. I'm giving the RFB one more chance to run right. I'm using identical hand loads and if I can get 20 rounds to run through it in a string it's a oddity. Got a load that is as accurate as you can get a RFB but it just doesn't want to feed. I'm losing faith in it quickly.