San Tan Tactical STT-15 Pillar Upper Receiver – Forged 7075-T6 AR-15 Platform

The San Tan Tactical STT-15 Pillar Upper Receiver is a forged 7075-T6 aluminum upper designed for AR-15 pattern builds. This stripped upper receiver features San Tan's proprietary Pillar bedding system, which provides enhanced barrel-to-receiver contact for improved accuracy and consistency. Compatible with mil-spec AR-15 lower receivers and standard barrel nuts.

Forged from 7075-T6 aluminum with Type III hard coat anodizing for durability and corrosion resistance. The upper includes M4 feed ramps and is machined to mil-spec dimensions. Accepts standard charging handles, bolt carrier groups, and handguards. This is a stripped upper receiver—barrel, handguard, and other components sold separately. Assembly requires standard AR-15 armorer's tools and knowledge of proper headspacing procedures.

• Caliber: Multi (5.56 NATO / .223 Wylde / .300 BLK compatible with appropriate barrel)
• Type: Stripped Upper Receiver
• Compatible Lower: Mil-spec AR-15
• Material: Forged 7075-T6 Aluminum
• Finish: Type III Hard Coat Anodized
• Includes: Upper Receiver Only (Stripped)
• Installation: Requires barrel, bolt carrier group, charging handle, and handguard (sold separately)