Shield Arms SA-15 | Folding Billet Lower | B5 Bravo

The Shield Arms SA-15 is a complete billet lower receiver designed for compact storage and modular AR-15 builds. It features a built-in folding mechanism (this product is explicitly not an adapter), is machined from aircraft-grade billet aluminum, and ships assembled with B5 Systems components and an H2-weight buffer. The receiver is marked “MULTI,” supporting multi-caliber configurations when used with compatible uppers and components. Typical applications include range-focused AR builds and multi-caliber or modular competition platforms.

Product Specifications

• Built with a folding mechanism for compact storage and transport; this is not an adapter.
• The receiver is machined from 7075-T6 aircraft grade billet aluminum.
• Ships with a proprietary buffer with an H2 weight designation included.
• The lower accepts standard AR-15 magazines.
• Finished in matte black hard-coat anodize per Mil 8625 Type 3 Class 2.
• Features a precision-machined magazine well with a beveled feed lip for easier magazine changes.
• The receiver is caliber marked as MULTI.
• Compatible with standard AR-15 components and most aftermarket parts.
• Serviceability features include a takedown pin spring/detent hole threaded for a 6-32 set screw, an upper tension screw behind the grip to adjust vertical fit, and a threaded bolt catch pin; hardware included.
• Equipped with a B5 Systems Bravo rifle stock as shipped.
• Includes an EDT Designated Marksman assembly with a Duplex Trigger Bow.
• Uses a Radian Safety Selector.
• Includes a B5 Systems grip.
• The UPC is 850029544548.

This Shield Arms SA-15 complete lower blends a billet construction with practical serviceability features and factory-installed B5 Systems components for a ready starting point in multi-caliber and modular AR builds. Its folding mechanism and precision-machined magwell make it a strong option for shooters assembling compact or specialized range platforms who want a durable, serviceable lower with modern ergonomics.