Our STT-15L has been designed for those who participate in 3-gun, hunting, or any other shooting activity where weight is a concern.

The STT-15L Lower weighs 7.7 oz and accepts all Mil-Spec AR-15M16 components and lower parts kits.

The STT-15L Upper weighs 6.9 oz and works with all Mil-Spec AR-15M16 components including all known handguard options currently available.

STT-15L Lite PILLAR Billet Lower Receiver

We machine the STT-15L directly from a billet of 7075-T6 Aerospace Grade American Aluminum on our industry-leading CNC machinery. This process allows us to hold ultra-tight tolerances and make sure that the final product is comes out precisely as designed. The receiver is finished in Mil-Spec, MIL-A-8625 Type III Class II hard anodizing.

Lower Features:

• Huge 1.38″ Integrally Machined Magazine Well Flare
• San Tan Tactical Truss Pockets for Increased Structural Rigidity
• Bullet Pictogram Safety Selector Markings
• Set Screw Trigger Creep Adjustment
• Set Screw Upper Take Down Tension Adjustment
• Shooter Ready Finger Rest
• Oversized Winter Trigger Guard Perfect for Gloved Hands
• Dowel Screw Assembly
• Ultra-Grip Texture on All Controls
• Backed by STT’s Unmatched Lifetime Warranty
• Made in the USA

STT-15L Lite PILLAR Billet Upper Receiver

The STT-15L Lite Upper Receiver features the same design and characteristic as the standard STT-15 Upper; however, the STT-15L is significantly lighter in weight from other manufacturers. Also, by removing the forward assist, the weighted on this product is reduced even further. This stripped upper weighs a mere 6.9 ounces instead of the 8.2-ounce weight of the standard STT-15 Upper.

Upper Features:

• San Tan Tactical Truss Pockets for Increased Structural Rigidity
• Cut from a Single Billet 7075 -T6 Aerospace Grade Aluminum
• Shell Deflector
• Forward assist has been removed from upper to reduce weight
• 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
• Mil-Spec Type III Class II Hard Coat Anodized Black
• No Roll Pin Design (Forward Assist Attaches Via Threaded Dowel Pin)
• Lightweight- Weighs in at Only 6.9 Ounces
• Compatible with a Multitude of Rail Manufacturers Anti-Rotation Tabs & Pins, Including Noveske NSR® Rail
• Compatible with All Known Battery Assist Levers on the Market Today
• Backed by STT’s Unmatched Lifetime Warranty
• Made in the USA

Model: STT-15L
Caliber: 5.56 NATO \ .223 REM, 300 BLACKOUT, 22LR, Multi-Cal
Action: Semi-Auto
Dimensions: Length: 7.69” Width: 1.490” Height: 4.015”
Material: Billet 7075-T651 Aerospace Grade Aluminum, Cast A-2 Tool Steel
Butt-Stock: Works with Any Mil-Spec or Commercial Buffer Tube and Stock.
Magazine Compatibility: The pillar is compatible with all STANAG pattern M16/AR15 magazines.
Component Compatibility: Works with All Mil-Spec AR-15\M16 Components*

*Excluding Proprietary Ambidextrous Controls