Caliber: 5.56 NATO - Weight: 9.3 oz - Length: 4.5 in - Mount: 1/2-28 Thread - Sound Reduction: 19 dB - Diameter: 1.5 in - Materials: Titanium / Inconel - Finish: High-Temp. Cerakote - Operator-Comp for 5.56mm NATO comes with a removable core for cleaning and servicing as needed. It also comes with a built-in patented retention system to keep the suppressor from backing off during operation. - Packing includes the following: (1) 5.56mm suppressor (1) servicing tool for removable core. - For barrels: 10.25� minimum length 5.56x45/223