??? Muzzle Brakes / Flash Hiders ???

[Cossey]

@Mazdaspeed6

I prolly should know this but in New York can we have Muzzle Brakes and/or Flash Hiders on an AR15 (S&W M&P15). If so do we know any very friendly machine shops who can machine threads on the end of my barrel to allow me to screw one on?

No flash hiders, but muzzle brakes are ok as kind as they are permanently fixed, if I recall.