The Stern Defense complete 9mm AR-15 upper (brand part no. 015-SD4MOD4MLOK4BARREL9MMKK) is built around a 4-inch barrel finished in Melonite and rifled with a 1:10-inch twist, paired with an M-LOK-equipped handguard module that brings the complete assembly to roughly 18.75 inches overall. Built as a pistol-caliber-carbine upper for the AR-15 platform, it gives builders a compact, fully assembled 9mm upper ready to mount on a compatible lower. As with any upper, it does not include a lower receiver, so it’s classified as a component part, not a complete firearm.

Key Specifications

• Chambered in 9mm.
• Barrel measures 4 inches.
• Rifled at a 1:10-inch twist rate.
• Barrel finished in Melonite.
• Fitted with an M-LOK handguard module.
• Complete upper assembly measures approximately 18.75 inches overall.
• Sold as a complete upper, built for AR-15 pattern lowers.
• Configured as a pistol-caliber-carbine (PCC) style upper.
• Does not include a lower receiver, sold as a component part.

Frequently Asked Questions

What caliber is this upper chambered in? 9mm.

What is the barrel length? 4 inches.

Buy the Stern Defense Complete 9mm AR-15 Upper

Build a compact 9mm pistol-caliber carbine with a complete Stern Defense upper. Order it from our Stern Defense lineup, part of our AR15 uppers selection, and get it shipped fast from our Lubbock, Texas gun shop.