This comes up every couple months, clean the shit out of it/shoot the shit out of it and dear god don't clean the sum' bich'. I clean mine, not to perfection but what I'm satisfied with, everyone of my pistols, rifles, revolvers, shoot better than I'm able to utilize. If your happy with years of build up and you feel you can rely on it performing to the best of it's abilities by not cleaning , I say go for it.
I'm not comfortable with not cleaning, case in point. I own several AR's, used mostly for target. But once a year we do a S.D. trip for p-dogs. Wife and I went through 1700rds. over a weekend, lubed(no cleaning) both AR's after two solid days of shooting. The third day hers started having issues, FTF, FTE, looking at and comparing lugs/chambers/bolt and carrier's, of our AR's hers was significantly more built up with carbon. And I would guess I'd run more than half of those 1700rds, probably like a 60/40 ratio.
My point is, firearms are all different even when their the same, do what works for you and enjoy the sport.