The CMMG ZEROED 556 raw stainless suppressor is a standard-length 5.56mm can left in bare 17-4 stainless steel (CMMG part no. 11DB062). It shares the steel and full-auto rating of the coated ZEROED 556, but the uncoated finish starts smoky bronze and patinas with every range trip. It is 6.5 inches long with a mount and 1.58 inches in diameter. The 1.375-24 HUB thread accepts almost any direct thread or QD mount you choose, which is sold separately, and a 3/8-inch square drive sits in the fixed front cap. It is built for an AR-15 owner who wants a dedicated 5.56 can with a look of its own.

Key Specifications

• Bore diameter is .224 caliber, sized for 5.56x45mm and other .22-class centerfire cartridges.
• Overall length is 6.5 inches with a mount, or 6.2 inches without one.
• Weight is 17.4 ounces with a mount and 15.2 ounces without.
• Body diameter is 1.58 inches, so it fits under most rifle handguards.
• The finish is raw, uncoated 17-4 stainless, starting smoky bronze and changing with use.
• Attachment is the 1.375-24 HUB thread, with your choice of mount bought separately.
• The can is full-auto rated, the same rating as the nitrided ZEROED 556.

Frequently Asked Questions

Does it come with a mount? No. CMMG states that raw finished suppressors do not include a direct thread or QD HUB mount; one has to be added. The body takes any mount on the 1.375-24 HUB pattern.

Which calibers and barrel lengths is it rated for? CMMG lists .22 ARC, 4.6x30mm, 5.56x45mm and 5.7x28mm, with minimum barrel lengths of 5 inches for 5.7x28mm and 10.5 inches for 5.56mm.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

Buy the CMMG ZEROED 556 Raw Stainless Suppressor, 5.56mm, HUB Compatible

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through CMMG‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer. Choose the mount that matches your barrel and the can is ready for the range.