This is a Standard AC-556 with an 18" Barrel and no modifications. I was shooting standard off the shelf FMJ .556 ammo. Only hang up was on the mag its self. If I loaded the full 30 rds the first round would jam. If I loaded 28 rds it ran great. So I loaded 28 rds and this is the video. This day was the first time I had shot a full auto. Once you shoot a full auto you will want one. Enjoy.
