The Gemtech Nebula 5.7 combines a lightweight design with durable materials for use with 5.7x28mm and compatible rimfire calibers. Its 3D-printed titanium core is engineered for gas flow and heat dissipation, while a stainless steel blast baffle adds durability and supports full-auto capability. Weighing just 9 ounces, the Nebula measures 1.2 inches in diameter and features a black high-temperature Cerakote finish. Its mounting configuration includes a removable direct-thread mount and a Plan B-style mount interface, providing flexibility for compatible PDW and rimfire setups. Specifications Manufacturer: Gemtech Model: Nebula 5.7 Caliber Rating: 5.7x28mm, .22LR, .17HMR, .22WMR Length: 7.8" (listed product specifications also state 7.1") Diameter: 1.2" Weight: 9 oz. Mount Type: 1/2x28 Mounting Options: Removable direct-thread mount and Plan B-style interface Mount Material: 4140 steel, QPQ finish Tube Material: 17-4PH stainless steel Core Material: 6Al-4V titanium Blast Baffle: Stainless steel Finish: Black high-temperature Cerakote Rating: Full-auto rated Get it at BattleHawk Armory!