Featuring five of 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: 6.1 w/o adapter - WEIGHT: 14.5oz w/o adapter - MATERIALS: 17-4PH Stainless Steel 6AL4V Titanium - SUPPRESSOR FINISH: High-Temp Cerakote - MOUNT/MUZZLE FINISH: Armornite PVD - ATTACHMENT: 1.375-24 (HUB) ETM (included) - 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