Diameter: 1.5 - Overall Length: 8.4 - Length Added: 4.8 - Weight: 14.9 ounces - Materials: 17-4 Stainless Steel & 718 Inconel - Attachment: PSR DUAL-LOK Mounts - SPL: 129.7db (16 Griffin MK1 5.56mm) - Finish: Cerakote - Full Auto Rated: Yes - Key points : - Patent pending DUAL-LOK wear free mounting system requires no consumable parts - Taper lock interface ensures security and accuracy - ACME thread provides speed of attachment - Locking ring incorporates 3 anti-rotation teeth to eliminate inadvertent loosening - 120 effective positions ensure a rock-solid suppressor mount and provide extremely low POI shift - 17-4 stainless steel & 718 Inconel materials - Tubeless laser welded design - Patent pending ECO-FLOW baffle system for reduced blow back - Patent pending Pressure Reduction Cap with integrated flash hider - PSR DUAL-LOK 2 Port Muzzle Brake 1/2x28 5.56mm included - � wrench flats on muzzle devices - Collar Nitrided black and PVD'd on FDE models for increased surface hardness corrosion and wear resistance - Heat treated and Cerakoted Black or FDE in a heat resistant finish - Warrantied for life with Griffin's Perpetual Lifetime Warranty