The STT-15L Lite PILLAR Receiver Combo has all the same great aesthetics as our STT-15 Receiver but incorporates a significant weight reduction. The San Tan Tactical STT-15L Lower weighs 7.7 oz and accepts all Mil-Spec AR-15\M16 components and lower parts kits, excluding the ambidextrous controls. The STT-15L Upper weighs 6.9 oz and works with all Mil-Spec AR-15\M16 components including all known handguard options currently available.


  • A True Hand Matched Receiver Set With The Upper Serialized To Match The Lower Serial Number.
  • Huge 1.38” Integrally Machined Magazine Well Flare.
  • Short Throw Bullet Pictogram Safety Selector Markings Marked.
  • Set Screw Trigger Creep Adjustment.
  • Set Screw Upper Take Down Tension Adjustment.
  • Captured Rear Take Down Pin Detent And Spring.
  • Oversized Winter Trigger Guard.
  • No Roll Pin Design, Assembles Using Included Threaded Dowel Screw.
  • San Tan Tactical PILLAR® Truss Pockets For Increased Structural Rigidity.
  • Cut From A Single Billet Of 7075 -T651 Aerospace Grade Aluminum.
  • Shell Deflector
  • Machined In T Markings For Easy Optic Relocation.
  • Machined With M4 Feed Ramps.
  • Machined To Mil-Spec Standards.
  • Interfaces With All AR15/M16/M4 Weapons Systems And Accessories.
  • Accepts ALL Known Handguards Without Modifications.
  • Mil-Spec Type III Class II Hard Coat Anodized Black
  • Ultra-Light Design. Ultra Strong Yet Lite Weight. Weighing Only 14.6 Ounces / 413.9 Grams For The Matched Set.
  • Backed By STT’s Unmatched Lifetime Warranty.
  • Made in the USA!