The Stern Defense Mod5 upper (MPN 015-SD8INCHMOD5MLOK6INCHBA) is a complete AR-15 upper assembly chambered in .45 ACP with a 6-inch barrel.

Key Specifications

• Stern Defense complete .45 ACP upper assembly
• Chambered in .45 ACP
• 6-inch barrel, Black Melonite finish
• 1:16 inch rifling twist rate
• Free-float M-LOK handguard with clamp-on mounting
• Quick-disconnect sling swivel sockets
• Enlarged ejection port sized for .45 ACP rounds
• Glock-cut bolt, compatible with Glock and Colt SMG magazines
• Mil-spec flat-top upper receiver with laser-engraved dust cover

Frequently Asked Questions

Does this include a lower receiver?
No, this is a complete upper assembly only; it ships without a lower receiver or fire control group.

Are there legal restrictions on this barrel length?
At 6 inches, this barrel is well under the 16-inch federal minimum for a rifle-configured (shouldered/stocked) firearm. It’s intended for a pistol-configured (braced, no stock) build. Installing a sub-16-inch-barreled upper onto an already-assembled, shouldered rifle lower without prior ATF Form 1 approval creates an illegal, unregistered short-barreled rifle (SBR).

Buy the Stern Defense 45 ACP 6in Complete Upper

Build a compact .45 ACP pistol upper with this assembly from Stern Defense. Order from a Lubbock, TX gun shop in our AR-15 uppers lineup.