San Tan Tactical AR15 Upper Receiver 223 Rem/5.56 NATO – Flat Top, Black (STT-15-LT-PILLAR-UPPER)

• AR-15 upper receiver designed for 223 Rem and 5.56 NATO calibers
• Constructed from 7075-T651 aerospace grade billet aluminum for high strength
• Features M4 feed ramps and T markings for optic relocation
• Mil spec Type III Class II hard coat anodized black finish for durability
• Interfaces with all AR15 M16 M4 weapons and accessories
• Accepts all known handguards without modifications for versatile compatibility

The San Tan Tactical PILLAR Upper is an AR-15 upper receiver designed for rifle assembly and component integration. It is machined from 7075-T651 aerospace grade aluminum and supports both .223 Remington and 5.56 NATO calibers. The San Tan Tactical PILLAR Upper receiver is used for building or upgrading AR platform rifles with a flat top configuration.

This upper receiver features M4 feed ramps and machined T-markings for optic alignment and repeatable positioning. It includes a shell deflector and a mil-spec Type III Class II hard coat anodized black finish. The design accepts all known handguards without modification and interfaces with AR15, M16, and M4 systems. In standard configurations, the San Tan Tactical PILLAR Upper receiver supports compatibility with battery assist levers and is intended for rifle builds requiring a rigid billet construction.