Thread Pitch 5/8-24 - Modularity MODULAR- Replaceable Core and End Cap; Serialized Thread Mount - Mounting Direct Thread Aluminum Mount w/Titanium Thread Insert - Materials 100% Machined 7075 Aluminum Gr-5 Ti thread insert. - Features Built in Self Cleaning Carbon Cutters - Sound Reduction 20 Barrel 308 Win 133 db - Finish Hard Coat Anodizing - Weight 13.7 oz - Length 8 inches - Diameter 2 inches - Calibers .30 caliber cartridges up to 300 Win. Mag. - Rate of Fire Controlled 1 round every one second for up to 20 rounds. Then cool to ambient temperature