San Tan Tactical STT-15 Lite Semi Automatic Rifle 6mm Advanced Rifle Cartridge (6mm ARC) 18" Carbon Fiber Threaded Barrel Anodized Black Frame Black Pistol Grip

San Tan Tactical, Hornady Mfg and Proof Research have partnered up on the San Tan 6ARC rifles. San Tan's innovative high quality firearm systems and unparalleled performance in combination with Hornady's 6ARC round originally developed for a specialized group within the US DoD, and Proof Research premium carbon fiber barrels take the AR15 platform to a whole new level! The San Tan Tactical STT-15-6ARC rifles are a superb example of industry leading technologies from companies pushing the envelope with a desire to achieve more! With the other wildcat caliber's coming to market over the recent years, the recent 6.8 military requirement, all in an attempt to pursue the maximum output from the AR15 platform.The Hornady 6 ARC cartridge combined with their variety of projectiles currently available allows a significantly increase in capability above and beyond what is currently available in the AR15 platform. The capability to weight savings is seen in the STT-15-6ARC-Lite, the slick sided billet matched receiver set with the signature lightening pillar cuts. Removing as much weight as possible without sacrificing strength and performance.STT true matched pillar billet sets, hand finished, matching serial numbers. The upper is cut from a single solid 7075T6 Certified Aerospace Aluminum. Propriety special burnished bore that gives a compacted internal surface, resulting in a much smoother surface finish. The bore, receiver extension face, barrel nut threads and barrel extension surfaces are all machined in one operation ensuring that they are perfectly concentric and perpendicular to the barrel assembly.FeaturesSTT Suppressor Optimized Enhanced Bolt carrier groupSTT 6 ARC HPT MPI Bolt, Crane O-ring UpgradeProof Research 18" Carbon Fiber 6ARC BarrelMagPul CTR StockMagPul MBUS Pro