Davidson Defense Tenacious w/SBA5 Brace 10.5-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Full Build Kit

Tenacious SBA5 Brace 10.5-inch 1:10 9mm AR-9 Freefloat M-LOK Pistol Full Build Kit

The Tenacious is a 9mm AR-9 Full Build Kit built around a compact 10.5-inch direct blowback platform. The kit centers on a 10.5-inch medium profile 4150 CrMoV steel barrel with a nitride finish, 1:10 right-hand twist rate, and 1/2x36 thread pitch, paired with a KAK Industry 9mm mini compensator at 1/2x36 and a black 1/2-inch crush washer. The Vertex Enhanced Pistol Caliber AR-15 billet upper receiver in black is paired with a 10-inch freefloat M-LOK handguard in black featuring a full-length top Picatinny rail and integrated QD sling mounts. A complete 9mm nitride bolt carrier group in 8620 alloy steel with an external extractor compatible with Glock and Colt pattern magazines, and a Mil-Spec AR-15 M4 charging handle complete the upper side. The lower hardware includes a complete Mil-Spec AR-15 lower parts kit, a Mil-Spec heavy-duty 6-position aluminum carbine buffer tube, an AR-15 9mm carbine buffer, a USA-made standard AR-15 carbine recoil spring, a Mil-Spec AR-15 M16 receiver end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 adjustable pistol stabilizing brace in black is included. Lower receiver not included.

Key Features

• 10.5-inch medium profile 4150 CrMoV steel barrel, nitride finish, 1:10 right-hand twist, 1/2x36 thread pitch, 9mm
• Direct blowback platform
• KAK Industry 9mm mini compensator, 1/2x36, black 1/2-inch crush washer included
• Vertex Enhanced Pistol Caliber AR-15 billet upper receiver, black
• 10-inch freefloat M-LOK handguard, black, full-length top Picatinny rail, integrated QD sling mounts
• Complete 9mm nitride bolt carrier group, 8620 alloy steel, external extractor, Glock and Colt pattern magazine compatible
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec heavy-duty 6-position aluminum carbine buffer tube
• AR-15 9mm carbine buffer
• Standard AR-15 carbine recoil spring, made in USA
• Mil-Spec AR-15 M16 receiver end plate
• AR-15 carbine castle nut
• SB Tactical SBA5 adjustable pistol stabilizing brace, black

Perfect For

• AR-9 pistol builders sourcing a complete 9mm blowback full build kit with a Vertex Enhanced Pistol Caliber billet upper receiver, 10.5-inch nitride 4150 CrMoV barrel, KAK Industry 9mm mini compensator, 10-inch freefloat M-LOK handguard with full-length top Picatinny rail and integrated QD sling mounts, and SBA5 adjustable brace on a Mil-Spec carbine buffer tube already included, pairing it with their own lower receiver
• Shooters building a compact 10.5-inch 9mm direct blowback AR-9 pistol platform who want the AR-9 BCG, charging handle, complete lower parts kit, and SBA5 adjustable brace covered in one kit with a Vertex Enhanced Pistol Caliber billet upper receiver and freefloat M-LOK handguard with full-length Picatinny rail
• AR-9 PCC pistol builders who want a complete blowback full build kit with a Glock and Colt pattern magazine compatible BCG, a KAK Industry 9mm mini compensator, and a 10-inch freefloat M-LOK handguard with a full-length top Picatinny rail and SBA5 adjustable brace without sourcing components separately

Barrel and Muzzle Device

The 10.5-inch medium profile barrel is chambered in 9mm and constructed from 4150 CrMoV steel with a nitride finish. The twist rate is 1:10 right-hand and the thread pitch is 1/2x36, which matches the included KAK Industry 9mm mini compensator. A black 1/2-inch crush washer is included. The direct blowback platform design addresses the 9mm cartridge in an AR-9 pistol caliber build without a gas system.

Upper Receiver and Handguard

The Vertex Enhanced Pistol Caliber AR-15 billet upper receiver carries a black finish and is designed around the AR-9 pistol caliber platform. The 10-inch freefloat M-LOK handguard is black with a full-length top Picatinny rail, integrated QD sling mounts, and M-LOK attachment points along the body for accessory mounting. These two components define the exterior structure of the upper assembly on this AR-9 pistol platform.

Bolt Carrier Group and Charging Handle

The complete 9mm nitride bolt carrier group is 8620 alloy steel with a nitride finish and features an external extractor compatible with both Glock and Colt pattern magazines. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

Lower Parts Kit and Buffer System

The complete Mil-Spec AR-15 lower parts kit covers the internal lower receiver components. The buffer system includes a Mil-Spec heavy-duty 6-position aluminum carbine buffer tube, an AR-15 9mm carbine buffer, a USA-made standard AR-15 carbine recoil spring, a Mil-Spec AR-15 M16 receiver end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 adjustable pistol stabilizing brace in black pairs with the included Mil-Spec carbine buffer tube and covers the rear brace interface for this AR-9 pistol lower build kit.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify local and state laws regarding pistol brace use and classification. Verify compatibility with your specific 9mm AR-9 lower receiver and magazine pattern before use.