Surefire MB556K muzzle brake

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Jan 25, 2013
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Considering a Surefire MB556K muzzle brake for a build. Seem very clear it,s a brake but just wanted some feedback.
 
Unfortunately, I have no first hand knowledge, but a friend of mine who researched and ultimately bought one said that it needed to be "tuned" (which I understood to be torqued to just the right position with a pretty tight tolerance) that was best done by smiths with specific expertise with Surefire gear. That seemed a bit excessive to me, but I never did the research.
 
I doubt this is a "surefire" only issue, any brake will need to be properly aligned, if the ports point down it'll cause more muzzle rise instead of less.
 
http://www.surefire.com/mb556k.html

"NOTE: SureFire muzzle brakes and flash hiders also serve as adapter mounts for our Fast-Attach® sound suppressors. If you do not plan to attach a SureFire sound suppressor to your firearm, we recommend choosing a shorter-length muzzle brake or flash hider. SureFire muzzle brakes and flash hiders that mate with our overlap suppressor models are longer in order to extend rearward over the barrel, a feature that is unnecessary unless mounting an overlap suppressor. "
 
Just wondering about the legality of it being a brake only in Massachusetts. The fact that it is longer is okay because it will be pinned on a 14.5
 
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