[jamz]

It's a post-ban Bushmaster gun, the barrel is marked "8 MP 5.56 NATO 1/9 H BAR" I[m pretty sure that it means chambered for 5.56, 1 in 9 twist, heavy barrell. It has a muzzle brake that I'd love to take off. I can''t see if it's pinned anywhere, but I'm not sure if it's a permanent fixture or not.

Do these things just unscrew, or what?

 

[Shad]

Yeah, they just screw off. There should be 2 flat spots towards the base on opposite sides of the muzzle brake. That's where you put the wrench. (there's an actual tool designed to do that, but I just use a non-adjustable wrench, forgot which size works).