Dark mode is

Product Unavailable

Unfortunately, the following product is currently unavailable through Rainier Arms.

San Tan Tactical STT-15-6ARC 6mm ARC Rifle - 18" Black

AR-15 Rifle


San Tan Tactical®, Hornady Mfg®, and Proof Research® have partnered up on the San Tan new 6ARC rifles. San Tan’s innovative high-quality firearm systems and unparalleled performance in combination with Hornady’s New 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!


San Tan Tactical STT-15-6ARC Rifle Features:

  • STT Upper Receiver
  • STT Lower Receiver
  • 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
  • MagPul CTR Stock
  • MagPul 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, hard coat anodized black
  • Features extended feed ramps
  • Ambidextrous Mag and Bolt release controls (Ambi version only not Lite)
  • CERAKOTE options are available for an additional cost
  • Weight: 6lbs 13oz



  • Caliber: 6mm
  • Action: Semi-Automatic
  • Type of Barrel: Carbon Fiber
  • Barrel Length: 18"
  • Accessories: 1 Mag
  • Frame Material: 7075 Aluminum
  • Grips Stock: Magpul CTR Stock
More Information
Product Type AR-15 Rifle
Manufacturer San Tan Tactical
Color Black
Rail Length 16"
Barrel Length 18"
Caliber 6MM Creedmoor

Product Recommendations

Google Customer Reviews Google Customer Reviews