STERN DEFENSE | 15″ M-LOK Upper | .45 ACP

This Stern Defense AR-style upper is built for pist​ol-caliber carbine use in .45 ACP and ships configured with a long 16.1-inch Black Melonite-treated barrel and a 15-inch M-LOK forend. The assembly includes an upper receiver with dust cover and forward assist, a Glock-cut bolt carrier, an enhanced charging handle, and a compensator break. The design suits competition pistol-caliber carbine (PCC) divisions and precision range training where .45 ACP ballistics and a stabilized barrel platform are desired.

Product Specifications

• The caliber is .45 ACP.
• The barrel length is 16.1″.
• The barrel material is 4150 Chrome Moly Steel.
• The barrel finish is Black Melonite.
• The receiver material is 7075-T6 Aluminum with an anodized finish.
• The finish type on the receiver is Anodized.
• The included handguard is a 15 inch M-LOK rail.
• The package includes a Stern Defense SD BU45 Glock cut bolt.
• The upper ships with a SD CH1 enhanced charging handle.
• The muzzle device is a SD CB45 compensator/break.
• The assembled upper includes a dust cover and forward assist.
• The rate of twist is 1:16″.
• The action listed is .45 ACP.
• The product UPC is 850001176064.
• The package contents note barrel nut, bolts, and related mounting hardware included with the rail

This upper provides a stable, long-barrel platform for shooters who prefer .45 ACP ballistics in an AR-pattern assembly. Its combination of a 15″ M-LOK rail and a 16.1″ Melonite-treated barrel offers a balance of sight radius and accessory mounting flexibility, making it suitable for PCC competition, deliberate range practice, and precision target work. The included Glock-cut bolt carrier and enhanced charging handle support reliable function with compatible magazines and lowers.