Davidson Defense Ion w/SBA5 Brace 4.5-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Full Build Kit

Ion 4.5-Inch 1:10 9mm AR-9 Free-Float M-LOK Handguard Pistol Full Build Kit with SB Tactical SBA5 Brace

The Ion Full Build Kit is built around a 4.5-inch 9mm barrel with a 6061 billet pistol caliber AR-15 upper receiver, a 4-inch free-float minimalist M-LOK handguard, and a complete 9mm bolt carrier group, charging handle, and SB Tactical SBA5 pistol stabilizing brace. Lower receiver is not included.

Key Features

• 4.5-inch 9mm barrel, medium profile, 1:10 twist, Nitride finish
• 6061 aluminum billet pistol caliber AR-15 upper receiver
• 4-inch K-style free-float minimalist M-LOK handguard
• 9mm flash can on 1/2x36 threads with 1/2-inch black crush washer
• 8620 alloy steel 9mm Nitride BCG, compatible with Glock and Colt pattern magazines, and mil-spec quality M4 charging handle included
• Complete mil-spec AR-15 Lower Parts Kit and buffer-system components included
• SB Tactical SBA5 pistol stabilizing brace included
• Lower receiver is not included.

Barrel and Muzzle Device

The 4.5-inch barrel is machined from 4150 chrome moly vanadium steel in a medium profile with a Nitride finish and a 1:10 twist suited to 9mm. The muzzle carries a 9mm flash can on 1/2x36 threads, secured with the included 1/2-inch black crush washer.

Upper Receiver and Handguard

The upper receiver is a 6061 aluminum billet unit built for the pistol caliber AR-15 platform. It's paired with a 4-inch K-style, ultra-lightweight minimalist free-float M-LOK handguard, built without anti-rotation tabs for a slim profile along the short barrel.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is machined from 8620 alloy steel with a Nitride finish and an external extractor, built for compatibility with Glock and Colt pattern magazines. A mil-spec quality AR-15 M4 charging handle is included alongside it.

Lower Parts Kit and Buffer System

A complete mil-spec AR-15 Lower Parts Kit is included, along with the carbine castle nut and mil-spec receiver end plate. The buffer system pairs an AR-15 9mm carbine buffer with a USA-made standard AR-15 carbine recoil spring, cycling inside a mil-spec heavy-duty six-position carbine buffer tube.

Brace

An SB Tactical SBA5 pistol stabilizing brace in black is included, compatible with the mil-spec carbine buffer tube used in this build.

Follow all manufacturer instructions and safe handling practices.

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

Lower receiver is not included.