I'm looking for one of the type shown on the far-left of the picture below. The type with flash-hider slots and holes around the full diameter of the body. With or without the original locknut, very good to excellent condition preferred, but some finish wear is okay. Threaded 1/2"x28 for standard AR-15/M16 muzzle threads.
Please email me if you have one you'd be willing to sell. My email address is listed in my contact information for this website.