Greetings, just picked up my M&P10 yesterday, MA compliant version. I am looking for advice on a good muzzle brake, I would prefer something fairly large in size as well. Also, anyone from MA, I am looking for recommendations for a gunsmith in southeastern MA to thread the barrel and install the brake.

Thanks a lot!

I am in the same boat !!! and leaning toward the Good Iron break

AR-15/M16/AR-STYLE .308 "GOOD IRON" MUZZLE BRAKES | Brownells