Zev Tech Core 556 1:7 twist barrel. Has a Q Cherry Bomb Compensater on it for quick attach for a suppressor, superlative arms adjustable gas block installed, custom trigger spring kit for a 1.5lb trigger pull, and a VLTOR stock with their A5 buffer system for smooth recoil. I have a holosun 512 green dot on it. Lots of upgrades put into this rifle, its a shooter. Runs great suppressed and unsuppressed.