Product Features AC30 B.O.B. is a back-over-barrel suppressor that improves balance and adds internal volume without adding as much length by partially enclosing the barrel, unlike traditional suppressors mounted at the muzzle. Ensures minimal addition to your firearm s weight, making it comfortable to carry all day during hunting expeditions or long-range shooting activities. This innovative approach results in a suppressor that not only reduces the sound but also minimizes other disturbances like flash and recoil. Fully serviceable in the field and designed in three pieces, ensuring that servicing it is straightforward. Any necessary adjustments can be done swiftly without the need for specialized tools or equipment. This suppressor has been built with military-grade materials, ensuring durability without compromising on the weight. Product Specifications 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