The Optimus Micro re-defines the rimfire class of suppressors by offering the most durable and versatile rimfire suppressor ever designed. – Utilizing state of the art manufacturing and heat treated 17-4 stainless steel throughout the Optimus Micro supports 5.56mm cartridges out of the box using the included 1/2×28 direct thread mount. – Interlocking HEDP patented baffle technology provides uncompromising sound performance while ensuring durability and proper orientation. Patent pending dual taper locking front caps ensure the suppressor can be used vigorously without fear of unintentional disassembly. – Additionally the suppressor supports 3 lug mounting with the use of the Griffin 3 Lug Kit (which is compatible with the Optimus 9mm Revolution and Resistance suppressors). Taper Mounts can also be used with the Optimus Micro Taper mount accessory interface. In the Taper Mount configuration the Optimus Micro is rated for 22-250 caliber on 22 or longer barrels. – Common Calibers supported are : 22lr 22WMR 17HMR 5.7mm (no barrel restrictions) – Thread mounted and 3 lug ratings : 22 hornet .223 / 5.56mm 14.5 barrel. – Taper Mounted ratings : 12.5 .223 / 5.56mm — 16 or longer barrels 22 nosler .224 Valkyrie – 22hornet – 20 or longer 204 Ruger .222 Remington – 22 or longer 224 weatherby magnum 22-250 remington – Optimus Micro Includes: Tube body End cap and lock ring 5 baffles 1/2×28 direct thread mount manual and microfiber pouch. NOTE: 3 lug kit and Optimus Micro Taper Mount Interface as well as Griffin Taper Mounts are sold separately. – Standard Configuration (as packaged in box) : 8.5 Ounces 5.3 In length x 1.1 OD – Taper Mount Configuration : 10.5 Ounces 6.8 long x 1.2 OD – 3 LUG QD Configuration : 10 Ounces 5.5 long x 1.2 OD – 115DB SPL on 22lr Pistols – 116 DB SPL on 22 Rifles – 130DB SPL @ shooters ear on 22-250 20 Bolt Action Rifle – 129DB SPL @ shooters ear on 223 Remington Bolt Action Rifle