The Stern Defense 015SD15INCHMOD5MLOK161 .45 ACP Complete AR-15 Upper brings together a 16.1" Black Melonite 4150 chrome moly steel barrel, a 7075-T6 aluminum hard-coat anodized receiver, and a 15" free-float M-LOK handguard in one ready-to-run package. This blowback-operated upper includes Stern’s SD CB45 compensator break at the muzzle, an enlarged ejection port for .45 ACP, and laser-engraved dust cover and forward assist for a clean, functional look.

Designed as a dedicated pistol-caliber upper, this MOD5 assembly is ideal for range use, training, and relaxed big-bore plinking when paired with a compatible mil-spec AR-15 lower and proper buffer setup. The included SD BU45 Glock-cut bolt works with Glock-pattern and Colt SMG magazines, while the SD CH1 enhanced charging handle supports smooth manipulation. Stern Defense’s attention to machining, materials, and reliability is evident throughout this upper.

Key Features:

• Manufacturer: Stern Defense
• Model: MOD5 15" M-LOK 16.1" .45 ACP Upper (015SD15INCHMOD5MLOK161)
• Caliber: .45 ACP
• Action: Blowback
• Barrel Length: 16.1"
• Barrel Material: 4150 Chrome Moly Steel
• Barrel Finish: Black Melonite
• Handguard: 15" Free-Float M-LOK
• Receiver Material: 7075-T6 Aluminum, Hard-Coat Anodized
• Bolt: SD BU45 Glock-Cut, Compatible With Glock-Pattern And Colt SMG Magazines
• Muzzle Device: SD CB45 Compensator Break