The result of a partnership with Proof Research and Hornady Manuracturing, the San Tan Tactical STT-15-6ARC ushers in the Hornady 6mm ARC era.

San Tan Tactical recently partnered with Hornady Manufacturing and Proof Research on the new STT-15-6ARC rifle. The AR-15-type rifle utilizes a Proof Research carbon-fiber barrel and chambers the new Hornady 6mm ARC cartridge.

STT-15-6ARC Rifle Details

The Hornady 6mm ARC cartridge increases capabilities in the AR platform. The STT-15-6ARC utilizes a slick-sided billet matched receiver. It saves weight without sacrificing strength or performance, according to STT.

The upper features a single, solid 7075 T6 aluminum receiver. A proprietary burnished bore delivers a compacted internal surface, resulting in a smoother surface finish. The bore, receiver extension face, barrel nut threads and barrel extension surfaces all feature a one-operation machine process. The come perfectly concentric and perpendicular to the barrel assembly, according to STT. 

San Tan Tactical STT-15-6ARC Rifle Features

  • STT Suppressor Optimized Enhanced Bolt carrier group
  • STT 6 ARC HPT MPI Bolt, Crane O-ring Upgrade
  • Proof Research 18” Carbon Fiber 6ARC Barrel
  • CMC Triggers 3.5lb Single Stage Match Trigger
  • MagPul MOE plus Grip, CTR Stock, MBUS Pro
  • STT 15 16” MLOK Rail
  • Precision CNC machined from billet 7075-T6 certified aluminum
  • Propriety special burnished bore that gives a compacted internal surface, resulting in a much smoother surface finish
  • Type 3, class 2, deep black, hardcoat anodized black
  • Features extended feed ramps
  • Ambidextrous Mag and Bolt release controls (ambi version only not Lite)
  • CERAKOTE options are available for additional cost
  • MSRP: $2,895

For more information, visit

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