5.56mm is one of the most ubiquitous calibers in the USA so why not have a dedicated suppressor for your 5.56mm firearm? Made to deliver maximum sound suppression on .22 caliber centerfire cartridges the ZEROD 556K keeps things light and tight with its compact K size footprint and direct thread mounts and an overall length of just 5.5. – Although reasonable in price the ZEROED 556K makes no compromises in quality. Full 17-4 stainless construction and a nitride finish means this suppressor resists fouling and corrosion like no other. For easy disassembly the included direct thread mounts feature 7/8 wrench flats and the suppressor features a 3/8 square drive in the end cap. – All ZEROED suppressors are made 100% in house by CMMG in our facility allowing for maximum quality control and affordability. – Material: Heat Treated 17-4 Stainless Steel – Attachment: Direct Thread / HUB Mount – Diameter: 1.58 – Included In The Box – Suppressor – (1) 1/2-28 Direct Thread HUB Mount – (1) 5/8-24 Direct Thread HUB Mount – Caliber .22 ARC 5.56x45mm 5.7x28mm 4.6x30mm – Finish Nitride – Weight 13.5 oz / 11 oz w/o mount – Length 5.5 / 5.2 w/o mount