Your shooting would satisfy the military requirement for carbine accuracy. I wouldn't consider doing anything to it. Typically you don't choose a carbine for high-accuracy shooting which is why the military sighting target for 100 yds is 12" high and 16" wide. All shots should be on the sighting line (point of aim) or above. This definitely was a weapon that was designed for the 6:00 hold. True, you can do all kinds of things and shoot hand loads to get better accuracy but to me its sort of wasted time - it is what it is. BTW, if you shoot lead and jam up the gas port with it, you'll have to fidget with the piston retaining nut which is supposed to be staked in place and not reused. The piston has to be removed to get a cleaning tool up in the gas port by way of the little hole in the gas block for that purpose. Your call - shoot lead if you want to, but if you goof up and crack the gas block, which has happened many times, the barrel is toast.
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