The CFC MINI 556 (Combat Flash Compensator) A.K.A. the ZCOMP(TM) is a Hybrid muzzle device.The CFC-M-556 is designed to reduce and distort visible muzzle flash, reduce muzzle rise & mitigate felt recoil. Function of the CFC-M-556 muzzle device is equaled by the exceptional visible manufacturing quality & appearance of the muzzle device.FEATURES- Manufactured from Stainless Steel QPQ Nitride finished for durability & corrsion protection-standard 1/2 28 RH ID threads .862" max diameter, 1.742 long (A2 PROFILE) Surface Hardness-68RC Weight- 1.7 ozs Caliber- 5.56mm / .223 Remington only Rating- Full Auto Zero porting on bottom side to reduce ground signature when fired from the prone position Zero porting on the top side center to reduce flash sight obstruction through optics/sights Large combustion chamber with ports on each side to aid flash distortion Crush washer included (not for suppressor use) Made in the USA