Featuring four of Gemtech's latest patent-pending technologies the versatile Neutron 7.62 strikes the perfect balance between size strength and weight. From a short-barreled machine gun to a favorite hunting rifle the Neutron accepts a wide range of mounting hardware to better suit the host and task at hand. Its refined baffle and flash hider end cap designs mute muzzle signature and the included ETM adapter and muzzle brake offer rapid mounting and perfect alignment. Caliber Rating: 5.7X28MM - 300WM Length: 6.6" w/o adapter Weight: 14.6oz w/o adapter 17-4PH Stainless Steel 6AL4V Titanium High-Temp Cerakote finish Armornite PVD muzzle device/mount finish Attachment: 1.375-24 (HUB) ETM (Included) Full Auto Rated Barrel Restrictions: 5.7X28: 3" 5.56 NATO: 7" 6MM ARC: 7" 300BLK: 3" 7.62X39: 7" 308WIN: 12" 6.5CM: 16" 300WM: 16" Tubeless design eliminates unneeded weight High Efficiency Baffle Design for high sound reduction Greater Wall Thickness than competitors for long-term durability and safety.