Bartholomew Roberts
Member
(I'd probably be a bit less biased if my own pre-'94 Colt Competition HBAR didn't choke to a halt after every 200 or so rounds until I cleaned it spotless again...)
Something is mechanically wrong with that gun.
I've fired 800rds in a single day through an AR with no cleaning at all and only a shot of CLP through the ejection port around the 450 mark. I've also never seen a case of stoppage caused by solely by fouling from direct gas impingement in 15 years of using the system, so long as CLP is occasionally added.