ThePunisher'sArmory
Member
I bought a Bushmaster XM-15 E2S M4 style carbine with what appears to be a Bushmaster AR-AK upper with the heavy barrel and an AK-74 style compensator. The problem im having is that my shot groups open up the more rounds fired and the more the barrel heats up. Also to note my gun was resting on the bipod in the same spot the whole time no changes from shot to shot. It also does this with any ammo. shot groups open up from 1.5" @ 75yrds to about 4" @75yrds after 20 rounds. The bore and barrel rifling look fine to me but i am no gunsmith by any means. I bought it used for a hell of a deal about $820, after high illinois taxes, last year. Does anyone know what could be wrong, does it sound like my barrel is "shot out" and need a new one. Please help.