CMMGA(R) ZEROED 556 .22 CALIBER DIRECT THREAD SUPPRESSOR The best way to tame the report of your 5.56mm/Centerfire .22 caliber firearm? It's with the ZEROED 556 of course. With the standard length profile of 6.5", the ZEROED 556 keeps the noise down without beating up your wallet. Budget friendliness doesn't mean sacrificing quality though. Through-hardened 17-4 stainless steel baffle construction with a nitride finish allows the ZEROED 556 to resist corrosion and provide a full auto rating to combat load strings of fire between cooldown periods. To maximize compatibility out of the box each suppressor includes two direct thread HUB mounts, a 1 Mfg: Cmmg