The San Tan Tactical STT-15L Lite Pillar billet receiver combo pairs a stripped lower and a stripped upper in olive drab green anodized finish (San Tan part no. STT15L-COMBO-ANO-OD). San Tan Tactical machines both halves from 7075-T6 aluminum billet and trims weight for 3-gun and hunting builds, with the lower at 7.7 ounces and the upper at 6.9 ounces. The lower accepts all mil-spec AR-15/M16 components and lower parts kits, and the upper works with the mil-spec parts and handguard options builders already use. It is made in the USA and carries the company lifetime warranty.

Key Specifications

• The material is 7075-T6 aluminum billet, an aerospace-grade alloy that is machined from solid stock for tight tolerances.
• The finish is MIL-A-8625 Type III Class II hard anodizing in olive drab green, which protects the surface from wear.
• The caliber rating is 5.56/.223, the standard AR-15 chambering.
• The lower weighs 7.7 ounces, a weight reduction from the standard STT-15 design for weight-sensitive builds.
• The upper weighs 6.9 ounces because the forward assist has been removed to cut weight.
• The lower has a 1.38-inch integrally machined magazine well flare, which speeds up magazine changes.
• Truss pockets on both receivers add structural rigidity, a signature of the San Tan Tactical design.
• The lower includes an oversized winter trigger guard, which leaves room for a gloved finger.
• The lower carries bullet pictogram safety selector markings and a shooter-ready finger rest.
• The upper adds a shell deflector, M4 feed ramps and T markings for relocating an optic.

Frequently Asked Questions

Does the upper have a forward assist? No. San Tan removed the forward assist from this upper to reduce its weight to 6.9 ounces.

Will standard AR-15 parts fit? The lower accepts all mil-spec AR-15/M16 components and lower parts kits, and the upper works with mil-spec components and a wide range of handguard options, including anti-rotation tab and pin styles.

What is included in the set? The combo is a stripped lower receiver and a stripped upper receiver, so you add the parts kit, barrel, bolt carrier group and handguard of your choice.

Buy the San Tan Tactical STT-15L Lite Pillar Billet Receiver Combo, Olive Drab Green Anodized, 5.56/.223

A lightweight billet pair is the quickest way to start a weight-conscious AR build in a color that stands out from the usual black. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more AR-15 lowers while you are here.