Davidson Defense IX w/SBA3 Brace 8.3-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Full Build Kit

IX 8.3 Inch AR-9 Full Build Kit 9mm Freefloat MLOK with SBA3 Brace

The IX AR-9 Full Build Kit is a complete pistol build package centered on an 8.3 inch 9mm barrel made from 4140 gun steel with a Nitride finish and a medium profile, carrying a 1:10 twist rate. The upper receiver is a billet design machined from 6061-T6 aluminum with a Type III hardcoat anodized finish, paired with a freefloat MLOK handguard made from aluminum in black, featuring a full top Picatinny rail and no anti-rotation tabs. This kit includes a complete bolt carrier group, charging handle, and an SB Tactical SBA3 adjustable pistol stabilizing brace.

Key Features

• 8.3 inch 9mm barrel, 4140 gun steel, Nitride finish, medium profile
• 1:10 twist rate, 1/2x36 thread pitch
• Billet 6061-T6 aluminum upper receiver, Type III hardcoat anodized finish
• Freefloat MLOK handguard, aluminum, black
• Full top Picatinny rail
• No anti-rotation tabs
• 9mm Nitride bolt carrier group, 8620 alloy steel
• Mil-Spec quality M4 charging handle
• Buffer weight 5.5 oz
• SB Tactical SBA3 adjustable pistol stabilizing brace, polymer, black

Perfect For

• Builders assembling a 9mm AR-9 pistol platform from the ground up
• Shooters wanting a billet upper paired with a freefloat MLOK handguard
• Builders looking for a matched bolt carrier group and brace in one kit

Barrel and Operation

This kit uses an 8.3 inch barrel made from 4140 gun steel with a Nitride finish and a medium profile. The 1:10 twist rate is suited to 9mm bullet weights, and the 1/2x36 thread pitch accepts standard 9mm muzzle devices. This build operates on a blowback system.

Upper Receiver and Handguard

The upper receiver is a billet design machined from 6061-T6 aluminum and finished in Type III hardcoat anodize. A freefloat MLOK handguard made from aluminum in black surrounds the barrel without contacting it, featuring a full top Picatinny rail and no anti-rotation tabs, giving the upper assembly a compact exterior forend built for a short pistol length platform.

Bolt Carrier Group, Charging Handle, and Brace

The included bolt carrier group is made from 8620 alloy steel with a Nitride finish, paired with a buffer weighing 5.5 oz. A Mil-Spec quality M4 charging handle rounds out the upper side component set. An SB Tactical SBA3 adjustable pistol stabilizing brace in polymer and black is included as part of this build kit.

Follow safe handling and manufacturer instructions.

Ensure compliance with all applicable federal, state, and local laws.

Component specifications are subject to the details provided in this listing.