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

Xiphos SBA5 Brace 10.5-inch 1:10 9mm AR-9 Freefloat KeyMod Pistol Full Build Kit

The Xiphos 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 twist rate, and 1/2x36 thread pitch, paired with a black A2 birdcage flash hider and a black crush washer. The Vertex Enhanced Pistol Caliber billet aluminum AR-15 upper receiver in black features a full-length Picatinny top rail, paired with a 10-inch ultra-slim KeyMod freefloat handguard in black aluminum. A complete AR-9 blowback bolt carrier group in 8620 alloy steel with a nitride finish and an external extractor compatible with Glock and Colt pattern magazines, and a black aluminum 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 A2 grip in black, a Mil-Spec heavy-duty 6-position black aluminum carbine buffer tube, a heavy 9mm PCC carbine buffer, a USA-made standard AR-15 carbine recoil spring, a steel AR-15 M16 Mil-Spec receiver end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 6-position adjustable pistol stabilizing brace in black reinforced polymer with integrated QD sling sockets is included. Lower receiver not included.

Key Features

• 10.5-inch medium profile 4150 CrMoV steel barrel, nitride finish, 1:10 twist, 1/2x36 thread pitch, 9mm
• Direct blowback platform
• Black A2 birdcage flash hider, 1/2x36, black crush washer included
• Vertex Enhanced Pistol Caliber billet aluminum upper receiver, black, full-length Picatinny top rail
• 10-inch ultra-slim KeyMod freefloat handguard, black aluminum
• Complete AR-9 blowback bolt carrier group, 8620 alloy steel, nitride finish, external extractor, Glock and Colt pattern magazine compatible
• Mil-Spec AR-15 M4 charging handle, black aluminum
• Complete Mil-Spec AR-15 lower parts kit, Mil-Spec A2 grip, black
• Mil-Spec heavy-duty 6-position black aluminum carbine buffer tube
• Heavy 9mm PCC carbine buffer, carbine length
• Standard AR-15 carbine recoil spring, made in USA, spring steel
• Steel AR-15 M16 Mil-Spec receiver end plate
• AR-15 carbine castle nut
• SB Tactical SBA5 6-position adjustable pistol stabilizing brace, black reinforced polymer, integrated QD sling sockets, Mil-Spec carbine buffer tube compatible

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, ultra-slim KeyMod handguard, nitride BCG compatible with Glock and Colt pattern magazines, and SBA5 6-position adjustable brace 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, heavy 9mm PCC buffer, and SBA5 adjustable brace with integrated QD sockets covered in one kit
• AR-9 PCC pistol builders who want a complete blowback full build kit with a Glock and Colt pattern magazine compatible BCG, a USA-made recoil spring, and an 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 and the thread pitch is 1/2x36, which matches the included black A2 birdcage flash hider. A black 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 billet aluminum upper receiver carries a black finish with a full-length Picatinny top rail for optics and accessory mounting. The 10-inch ultra-slim KeyMod freefloat handguard is black aluminum with KeyMod 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 AR-9 blowback 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 black aluminum 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 A2 grip in black. The buffer system includes a Mil-Spec heavy-duty 6-position black aluminum carbine buffer tube, a heavy 9mm PCC carbine buffer at carbine length, a USA-made standard AR-15 carbine recoil spring, a steel AR-15 M16 Mil-Spec receiver end plate, and an AR-15 carbine castle nut. The SB Tactical SBA5 6-position adjustable pistol stabilizing brace in black reinforced polymer features integrated QD sling sockets and pairs with the included Mil-Spec carbine buffer tube, covering 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.