A different look but the same sound suppression the ZEROED 30 in raw heat-treated 17-4 stainless steel brings robust build quality together with excellent .30 caliber (or smaller) performance. Standard 1.375-24 HUB threads let you use almost any direct thread or QD mounting system you prefer. Suppressor features a 3/8 square drive in the non-removable front end cap for easy HUB removal and attachment. – Organic (raw stainless) Finish – Starting as a smokey bronze color the raw uncoated stainless steel patinas with use making each organic suppressor unique in its constantly evolving pattern and coloring. Color and patina will change depending on number of rounds shot caliber type of firearm oiling and handling; Photos shown are not a guarantee of how the suppressor looks will change. – Raw finished suppressors do NOT include a direct thread or QD HUB mount but can be added. – Specifications – Caliber .22 ARC .300 BLK .308 WIN 4.6x30mm 5.56x45mm 6.5 Creedmoor 6mm ARC 6.5 Grendel 7.62x39mm – Finish Raw/Uncoated – Weight 15.5 oz / 13.5 oz w/o mount – Length 6.5 / 6.2 w/o mount – Diameter 1.58 – HUB Compatible Yes – Material 17-4 Stainless Steel – Attachment 1.375-24 HUB Mount Compatible – Minimum Barrel Length 300 BLK: 6.5 / .308 Win: 12.5 / 300 PRC: 20 – Full Auto Rated Yes – Bore Diameter .30 caliber