Caliber: 5.56 NATO - Weight: 15.5 oz - Length: 7.0 in - Mount: Bi-Lock QD - Sound Reduction: 32 dB - Diameter: 1.5 in - Materials: Titanium / Inconel - Finish: High-Temp. Cerakote - The heavy-duty Operator-HD-QD for 5.56mm NATO comes with a removable core for cleaning and servicing as needed and mounts with a Bi-Lock quick disconnect flash hider with standard 1/2 - 28 - 2B threads. - Packing includes the following: (1) 5.56mm suppressor (1) servicing tool for removable core (1) 1/2-28 flash hider. - For barrels: 10.25� minimum length 5.56x45/223.