I recently purchased a Griffin Armament paladin muzzle break for my AR. It's threaded for 1/2x28, which is what i purchased, but it seems to only screw on 1/4 of the way there before getting extremely hard to twist as if it's the wrong thread type. I've confirmed that the threads on my barrel are in fact 1/2x28 with a thread pitch gauge, even the surefire procomp I purchased with the rifle is threaded in 1/2x28 and twists on just fine. I've tried just about everything I could think of to make it fit but it just will not budge. Is there something I'm missing? I feel like it should be obvious but I just don't get it. any help is greatly appreciated!