It still shoots accurately after 6k? I don't clean my AR after each range day but that is a lot of rounds.
Depends on what you consider "accurate"? This is an issued Colt 14.5in M4 with free-float fore end. When new it averaged 5 shot 1-1.25 MOA groups with MK262 MOD1, which is 5.56mm pressure 77gr SMK's. It now averages around 1.5in or a little over for 5 rounds with MK262 MOD1. I expect the barrel to go at anytime so it is mostly regulated to a training gun anymore.
IME some will lose acceptable accuracy for the purpose (solid 2MOA) as soon as 4-5,000 rounds and others may go 10k+..... I start getting suspicious around the 6k mark as things tend to start to go south then- mainly bolts breakage and gas port erosion. In any case they don't have to be cleaned. Just keep them lubed.
