Davidson Defense Ronin Competition w/Gauntlet Arms Brace 5-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Full Build Kit

Ronin Competition Gauntlet Arms Brace 5-inch 1:10 9mm AR-9 Freefloat M-LOK Pistol Full Build Kit

The Ronin Competition 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 steel barrel with a 1:10 twist rate and 1/2x36 thread pitch, paired with a black 9mm A2 birdcage flash hider and a black crush washer. The USA-made Black Diamond Series slick side billet aluminum upper receiver features an ejection port door assembly and no forward assist housing, paired with a 4-inch Ace Series freefloat M-LOK handguard in aluminum. 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 heavy-duty AR-15 pistol buffer tube, an AR-15 9mm carbine buffer, a USA-made standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec end plate, and an AR-15 carbine castle nut. The Gauntlet Arms polymer stabilizing brace in black is included. Lower receiver not included.

Key Features

• 5-inch slim profile parkerized steel barrel, 1:10 twist, 1/2x36 thread pitch, 9mm
• Direct blowback platform
• Black 9mm A2 birdcage flash hider, 1/2x36, black crush washer included
• USA-made Black Diamond Series slick side billet aluminum upper receiver, ejection port door assembly included, no forward assist housing
• 4-inch Ace Series freefloat M-LOK handguard, aluminum
• 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
• Heavy-duty AR-15 pistol buffer tube
• AR-15 9mm carbine buffer
• Standard AR-15 carbine recoil spring, made in USA
• AR-15 M16 Mil-Spec end plate
• AR-15 carbine castle nut
• Gauntlet Arms polymer stabilizing brace, black

Perfect For

• AR-9 pistol builders sourcing a complete 9mm blowback full build kit with a USA-made Black Diamond Series slick side billet upper, nitride BCG compatible with both Glock and Colt pattern magazines, Ace Series freefloat M-LOK handguard, and Gauntlet Arms brace with a pistol buffer tube already included, pairing it with their own lower receiver
• Shooters building a compact 5-inch 9mm direct blowback pistol platform who want the AR-9 BCG, charging handle, pistol buffer tube, and Gauntlet Arms brace covered in one kit with a USA-made slick side billet upper
• AR-9 PCC pistol builders who want a complete blowback full build kit with a Glock and Colt pattern magazine compatible BCG and complete lower parts kit without sourcing components separately

Barrel and Muzzle Device

The 5-inch slim profile barrel is chambered in 9mm and constructed from steel with a parkerized finish. The twist rate is 1:10 and the thread pitch is 1/2x36, which matches the included black 9mm 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.

Upper Receiver and Handguard

The USA-made Black Diamond Series slick side billet aluminum upper receiver features an ejection port door assembly and removes the forward assist housing from the upper receiver body for a clean exterior profile. The 4-inch Ace Series freefloat M-LOK handguard is aluminum with 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 heavy-duty AR-15 pistol buffer tube, an AR-15 9mm carbine buffer, a USA-made standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec end plate, and an AR-15 carbine castle nut. The Gauntlet Arms polymer stabilizing brace in black pairs with the included pistol 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 lower receiver before use.