Featuring Gemtech's latest patent-pending technologies the all-new Abyss 5.56 is destined to redefine the hard-use suppressor category. Its proprietary design reduces muzzle flash and decibels while also reducing gas blowback for improved user comfort and host reliability. CALIBER RATING: 5.56 NATO 6MM ARC 5.7X28MM LENGTH: 6.2" WEIGHT: 16oz MATERIALS: 17-4PH Stainless Steel 6AL4V Titanium SUPPRESSOR FINISH: High-Temp Cerakote MOUNT/MUZZLE FINISH: Armornite PVD ATTACHMENT: 1.375-24 (HUB) FULL AUTO RATED BARREL RESTRICTIONS: 5.56 NATO: 7" 5.7X28MM: 3" 6MM ARC: 7" LOW BACK PRESSURE DESIGN for greater host reliability and shooter comfort HIGH EFFICIENCY BAFFLE DESIGN for high sound reduction GM-S1 END CAP DESIGN for minimized muzzle flash from the first shot to the last