Stern Defense 45 ACP AR-15 Upper Receiver 6" Barrel

Stern Defense 45 ACP Upper Receiver Assembly

This is a purpose-built upper receiver designed for shooters who want to build a dedicated 45 ACP AR-15 platform. It combines quality machining with thoughtful engineering to deliver a reliable, modular shooting system.

Key Features

Upper Receiver

• Mil-Spec flat-top design with laser-engraved dust cover and forward assist
• Machined from 7075-T6 aluminum for strength and durability
• Hard-coat anodized finish resists wear and corrosion
• Enlarged ejection port specifically designed for 45 ACP reliability
• Mil-spec dry film lube applied to bore

Barrel

• 6-inch 45 ACP barrel with Melonite finish
• Optimized for 45 ACP ballistics and function
• Delivers reliable performance in a compact package

M-LOK Handguard

• Free-floating design for consistent accuracy
• Machined from 6061 aircraft-grade aluminum
• Hard-coat anodized for durability
• Secure clamp-on mounting system withstands sustained fire and prone shooting
• Quick-disconnect swivel holes for sling attachment
• Lightweight without sacrificing strength

Bolt Assembly

• Machined from 8620 AISI steel with Mag-Phosphate finish
• Fully assembled with firing pin, springs, retaining pin, extractor, and springs
• Compatible with Mil-Spec and Glock-pattern upper receivers
• Functions with Colt SMG, Glock, and standard AR-15 magazines
• Features optimized design for single-stage triggers with short resets
• Compatible with Law Tactical folding stocks

Charging Handle

• Mil-spec design machined from 6061 aircraft-grade aluminum billet
• Hard-coat anodized finish
• Ergonomic latch design for positive grip and one-handed operation under stress

Perfect For

Builders seeking a complete, quality upper receiver for a dedicated 45 ACP AR-15 platform. All components work together seamlessly for reliable function and ease of assembly.