Davidson Defense Suppressor Ready Lifeline w/Gauntlet Arms Brace 5-inch 1:16 45ACP AR-45 Freefloat M-Lok Handguard Pistol Full Build Kit

Suppressor Ready Lifeline w/Gauntlet Arms Brace 5-inch 1:16 45ACP AR-45 Freefloat M-Lok Handguard Pistol Full Build Kit

This complete AR-45 pistol build kit delivers everything needed to assemble a suppressor-ready .45 ACP platform. The 5-inch 4150 CrMoV barrel with 1:16 twist rate pairs with a freefloat M-Lok handguard, Gauntlet. Arms polymer brace, and a full complement of upper and lower components. Lower receiver not included.

Key Features

• 5-inch 4150 CrMoV barrel with phosphate finish and 1:16 twist rate for .45 ACP
• Suppressor-ready .578x28 threaded muzzle
• Freefloat M-Lok handguard with 4-inch length and aluminum construction
• PCC AR bolt assembly for .45 ACP with 9310 alloy steel carrier and nitride finish
• Complete mil-spec lower parts kit with trigger and hammer components
• Heavy duty pistol buffer tube with 8oz buffer and carbine recoil spring
• Gauntlet Arms polymer stabilizing brace in black
• Type 3 Class 2 hardcoat anodized upper receiver in 6061-T6 aluminum
• AR-15 M4 mil-spec charging handle included

Perfect For

• Shooters building a .45 ACP pistol platform from component kits
• Suppressor-ready configurations for future sound reduction
• M-Lok accessory mounting and modular rail systems
• Freefloat accuracy and reduced handguard flex
• Compact pistol builds with stabilizing brace support

Suppressor Ready Configuration

This kit ships without a stock and is configured for suppressor use with a threaded muzzle ready for sound suppression devices. The .578x28 thread pitch accepts standard .45 ACP suppressors. The. Gauntlet. Arms brace provides support for pistol operation while the freefloat handguard maintains barrel alignment independent of mounting pressure. Verify suppressor compatibility with your specific device before assembly.

Component Specifications and Materials

The upper receiver uses 6061-T6 aluminum with. Type 3 Class 2 hardcoat anodize for corrosion resistance and durability. The barrel features 4150 CrMoV steel with phosphate finish, a proven material for reliability in .45 ACP platforms. The bolt carrier group uses 9310 alloy steel with nitride finish for wear resistance. The M-Lok handguard provides a lightweight aluminum platform for tactical accessories without adding unnecessary weight or bulk to the pistol configuration.

Build Kit Completeness

This full build kit includes the upper assembly, bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, castle nut, and end plate. All components are mil-spec quality or equivalent. Assembly requires only a lower receiver and basic tools. The kit delivers a complete operational platform once a stripped lower receiver is obtained and final assembly is completed according to manufacturer specifications.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Verify suppressor compatibility before use. May. Dropship from. Davidson. Defense.