Centurion arms billet upper
I just picked up my CM4 lower from the group buy from my FFL today. My dad and I have been planning an AR pistol together for months, and the lower was the last piece of the puzzle. We built it today and had a blast doing so. I only test fired it one time, but it cycled XM193 perfectly and locked back on an empty magazine. We'll be putting a lot more rounds through it this weekend!