Stern Defense 45 ACP 8″ Upper Assembly with 6″ M-LOK Handguard – Black Melonite Barrel & Anodized Receiver

Build your ultimate dedicated 45 ACP AR-15 upper with the Stern Defense SD8INCHMOD5MLOK6INC Upper Assembly. This fully assembled upper group is engineered for reliability, precision, and durability — and is ready to drop onto your AR-15 lower right out of the box.

**Barrel & Finish**
The 8″ barrel is chambered in 45 ACP and treated with a Black Melonite finish for outstanding corrosion resistance and a hard, wear-resistant surface that holds up in the harshest conditions.

**Upper Receiver**
Machined from 7075-T6 aircraft-grade aluminum and hard-coat anodized, this Mil-Spec flat-top upper receiver features a Stern Defense laser-engraved dust cover, forward assist, and an enlarged ejection port specifically designed to handle the larger 45 ACP cartridge. Mil-spec dry film lube is applied in the bore for added protection.

**6″ Free-Float M-LOK Handguard**
The 6″ free-float M-LOK handguard is machined from 6061 aircraft-grade aluminum and hard-coat anodized for long-term durability. Its secure clamp-on mounting system keeps the handguard locked firmly in place under heavy use, sustained fire, or prone shooting from a bipod. Quick-disconnect swivel holes are included for versatile sling attachment options.

**Charging Handle**
The included Mil-Spec charging handle is machined from 6061 aircraft-grade aluminum billet and hard-coat anodized. Its ergonomically designed latch provides a positive grip for easy, one-handed manipulation — even under stress.

**Bolt Assembly**
The Stern Defense bolt is machined from 8620 AISI steel with a Mag-Phosphate finish and fits both Mil-Spec and Glock-pattern upper receivers. It functions with Colt SMG and Glock-pattern magazines and is fully compatible with standard AR-15/M16 charging handles. The bolt comes fully assembled with all sub-components installed, including the firing pin, firing pin spring, retaining pin, extractor, and extractor spring, as well as proprietary center and roll pins. The updated bolt design is optimized for single-stage triggers with short resets and is compatible with the Law Tactical folding stock adapter.

**Key Features:**
– Chambered in 45 ACP
– 8″ Black Melonite barrel
– 7075-T6 aluminum flat-top upper receiver, hard-coat anodized
– Enlarged ejection port for 45 ACP compatibility
– Laser-engraved dust cover and forward assist
– 6″ free-float M-LOK handguard, 6061 aluminum, hard-coat anodized
– Secure clamp-on handguard mounting system
– Quick-disconnect swivel holes
– Mil-Spec charging handle, ergonomic latch
– 8620 steel bolt, Mag-Phosphate finish
– Compatible with Colt SMG and Glock-pattern magazines
– Fully assembled and ready to install
– Compatible with Law Tactical folding stock adapter

Whether you’re a competitive shooter, a dedicated pistol-caliber carbine enthusiast, or a custom build hobbyist, the Stern Defense 45 ACP upper assembly delivers proven performance and quality craftsmanship. Order online at Deep Roots Rifle Co for fast shipping nationwide, or stop by our gun store in Eustis, Florida, where our knowledgeable staff can help you complete your build.