Return area 419 customer, not last - Area 419 2 Port HELLFIRE Self Timing Muzzle Brake w/Adapter

I ordered the 9mm 2 port with nitride finish and 1/2 x 28 mount. Had recently purchased a CZ Scorpion Carbine and was not in love with some of the recoil associated with the recoil operated platform. Unsure of whether it would do what I wanted with that type of recoil impulse, but eureka huge taming even with 115gr fmj! Large print on front of muzzle brake to confirm inside diameter.