Gemtech 300 AAC Blackout GMT-300BLK Silencer Caliber – 300 AAC BLACKOUT Sound Reduction – 28-30dB Diameter – 1.5″ Length – 6.7″ Weight – 14 oz Mount – .625-24 Thread Material – Titanium Full Auto Rated – Yes Finish – Black Cerakote with reduced Visual-IR Signature For Barrels: 7.5″ or longer 300 BLK