Davidson Defense Nemesis X 5.5-inch 1:16 10MM AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build

Nemesis X 5.5-Inch 1-16 10mm AR-15 Freefloat M-LOK Handguard Pistol Complete Upper

This is a complete AR-15 upper chambered in 10mm Auto, built around a 5.5-inch heavy profile 10mm barrel with a black nitride finish and a 1-16 twist rate. The 6061 AR-15 slick side billet upper receiver made in the USA with an anti-rotation handguard cutout anchors the front end, a purpose-built receiver for the pistol caliber AR platform with a clean exterior profile that omits the forward assist from the receiver body. The 4.2-inch freefloat M-LOK handguard in 7075-T6 aluminum with an integrated hand stop covers the compact forend. A complete PCC AR bolt assembly for 10mm and .40 S-W and a Mil-Spec M4 charging handle complete the upper component set. A Pershing steel flash can at 5-8x24 closes out the muzzle end.

Key Features

• 10mm Auto chambering, 5.5-inch heavy profile barrel, black nitride finish
• 1-16 twist rate, 5-8x24 thread pitch
• 6061 AR-15 slick side billet upper receiver, USA made, anti-rotation handguard cutout
• 4.2-inch freefloat M-LOK handguard, 7075-T6 aluminum, integrated hand stop, black
• Complete PCC AR bolt assembly for 10mm and .40 S-W
• Mil-Spec AR-15 M4 charging handle
• Pershing steel flash can, 5-8x24 thread pitch
• Black 5-8-inch crush washer

Perfect For

• AR-15 pistol builders pairing a complete 10mm upper with an existing lower
• Shooters adding a compact 5.5-inch 10mm PCC upper to an AR-15 lower they already own
• Builders who want a USA-made slick side billet upper with an anti-rotation handguard cutout and a purpose-built blowback bolt already included in one complete 10mm upper assembly

Upper Receiver and Barrel

The 6061 AR-15 slick side billet upper receiver made in the USA anchors the front end with an anti-rotation handguard cutout that engages directly with the included 4.2-inch freefloat M-LOK handguard for a secure and indexed fit without anti-rotation tabs. The slick side exterior profile omits the forward assist from the receiver body, giving the upper a clean and streamlined appearance. The 5.5-inch heavy profile 10mm barrel brings a black nitride finish and a 1-16 twist rate to the 10mm Auto chamber, threaded at 5-8x24. The 4.2-inch freefloat M-LOK handguard in 7075-T6 aluminum surrounds the barrel along the compact forend with an integrated hand stop that gives the shooter a positive front hand reference point and M-LOK slots along the handguard body for accessory attachment.

Bolt Assembly and Charging Handle

The complete PCC AR bolt assembly for 10mm and .40 S-W is a purpose-built pistol caliber bolt assembly specific to the 10mm and .40 S-W blowback AR platform, distinct from a standard 5.56 bolt carrier group. The Mil-Spec M4 charging handle pairs with the bolt assembly inside the upper receiver to complete the upper interior. These two components complete the upper component set alongside the upper assembly, barrel, and handguard.

Muzzle Device

The Pershing steel flash can threads onto the 5-8x24 muzzle end of the barrel and closes out the front of this compact pistol-length upper with a flash can profile suited to the 10mm bore diameter at this thread pitch. The included black 5-8-inch crush washer seats at the barrel shoulder and completes the muzzle hardware for this upper.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.