Cross Machine Tool's ZCOMP(TM) LINEAR 9mm 1/2 36 thread provides forward directional muzzle blast control desired on rifles with shorter barrels.The outer diameter fluting and front nose cuts not only reduce the overall weight of the device but also blend with the aggressive aesthetic appearance of our Trademark magwell grooves on CMT UHP15 series Lower receivers. Function of the ZCOMP LINEAR muzzle device is equaled by the exceptional visible manufacturing quality & appearance you expect from Cross Machine Tool products. MADE IN USAFEATURES- 1/2- 36 RH ID threads 1.187" max diameter x 2.75" OAL. Nitride finish Weight- 5.3 ozs. Caliber- 9mm Rating- Full Auto Zero porting on bottom side to reduce ground signature when fired from the prone position Zero porting on the center top side to reduce flash sight obstruction through optics/sights minimal side port holes minimizing side blast concussion Crush washer included Made in the USA