Davidson Defense Nightshift w/SBA3 Brace 5-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Full Build Kit

Nightshift SBA3 Brace 5-inch 1:10 9mm AR-9 Freefloat M-LOK Pistol Full Build Kit

The Nightshift is a 9mm AR-9 Full Build Kit built around a compact 5-inch direct blowback platform. The kit centers on a 5-inch slim profile parkerized barrel with a 1:10 twist rate and 1/2x36 thread pitch, paired with a black A2 birdcage flash hider and a black 1/2-inch crush washer. The 7075-T6 aluminum hardcoat anodized upper receiver features M4 feed ramps, a forward assist, and an ejection port door assembly, paired with a 4-inch slim-line freefloat M-LOK handguard in black featuring a full-length Picatinny top rail. 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 with a Mil-Spec AR-15 A2 style grip, 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 a Mil-Spec AR-15 carbine castle nut. The SB Tactical SBA3 adjustable pistol stabilizing brace in black is included. Lower receiver not included.

Key Features

• 5-inch slim profile parkerized barrel, 1:10 twist, 1/2x36 thread pitch, 9mm
• Direct blowback platform
• Black A2 birdcage flash hider, 1/2x36, black 1/2-inch crush washer included
• 7075-T6 aluminum upper receiver, hardcoat anodized, M4 feed ramps, forward assist, ejection port door assembly
• 4-inch slim-line freefloat M-LOK handguard, black, full-length Picatinny top rail
• 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 AR-15 A2 style grip included
• 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
• Mil-Spec AR-15 carbine castle nut
• SB Tactical SBA3 adjustable pistol stabilizing brace, black

Perfect For

• AR-9 pistol builders sourcing a complete 9mm blowback full build kit with a 7075-T6 anodized upper receiver, 5-inch parkerized slim profile barrel, 4-inch slim-line freefloat M-LOK handguard with full-length Picatinny top rail, and SBA3 adjustable brace on a Mil-Spec carbine buffer tube already included, pairing it with their own lower receiver
• Shooters building a compact 5-inch 9mm direct blowback AR-9 pistol platform who want the AR-9 BCG, charging handle, complete lower parts kit, and SBA3 adjustable brace covered in one kit with a slim-line freefloat M-LOK handguard and full-length Picatinny top rail
• AR-9 PCC pistol builders who want a complete blowback full build kit with a Glock and Colt pattern magazine compatible BCG and a 4-inch slim-line freefloat M-LOK handguard with an SBA3 adjustable brace without sourcing components separately

Barrel and Muzzle Device

The 5-inch slim profile barrel is chambered in 9mm and carries a parkerized finish with a 1:10 twist rate and 1/2x36 thread pitch, which matches the included black A2 birdcage flash hider. 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 7075-T6 aluminum upper receiver carries a hardcoat anodized finish with M4 feed ramps, a forward assist, and an ejection port door assembly. The 4-inch slim-line freefloat M-LOK handguard is black with a full-length Picatinny top rail 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 and includes a Mil-Spec AR-15 A2 style grip. 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 a Mil-Spec AR-15 carbine castle nut. The SB Tactical SBA3 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.