Davidson Defense Aegis 14.5-inch Carbine-Gas 1:7 556 AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit, DTT Plan B Bartizan Muzzle Brake

Aegis 14.5-inch Carbine-Gas 1:7 5.56 AR-15 Freefloat M-Lok Pistol Upper Build Kit with Plan B Bartizan Muzzle Brake

This upper build kit combines a 14.5-inch 4150 CrMoV barrel with a free-float 12-inch M-Lok handguard and includes an adjustable gas block for tuning. The DTT Plan B Bartizan muzzle brake provides modular suppressor mounting compatibility while the 1:7 twist rate handles a wide range of 5.56 ammunition loads.

Key Features

• 14.5-inch 4150 CrMoV barrel with 1:7 twist rate and government profile
• Free-float 12-inch M-Lok handguard for rail flexibility and accuracy
• Low-profile adjustable gas block for recoil tuning and reliability
• DTT Plan B Bartizan muzzle brake with modular suppressor ecosystem support
• 7075-T6 upper receiver with M4 feed ramps and forward assist assembly
• Includes ejection port door assembly and stainless steel carbine-length gas tube

Perfect For

• Pistol builds requiring a capable upper without a stock or brace
• Shooters wanting free-float accuracy with M-Lok accessory mounting
• Builders seeking adjustable gas tuning for suppressed or unsuppressed configurations
• Mid-length barrel carbines optimized for 5.56 NATO performance

DTT Plan B Muzzle Brake Integration

The included. Plan B Bartizan muzzle brake is built on the DTT Plan B ecosystem, which supports modular suppressor mounting across compatible platforms. The 17-4 H1150 stainless steel construction with black nitride finish provides durability while the 1/2x28 thread pitch enables quick suppressor attachment or removal. This modular approach lets you configure the upper for suppressed shooting, brake-only shooting, or future suppressor integration without component swaps.

Free-Float Accuracy Platform

The 12-inch M-Lok handguard floats independently from the barrel, eliminating contact that can shift point of impact during shooting. Combined with the 14.5-inch barrel and adjustable gas block, this upper delivers consistent accuracy across different shooting conditions and ammunition types. The M-Lok slots provide mounting points for lights, grips, and other accessories without adding weight or bulk.

Carbine-Length Gas System Flexibility

The carbine-length stainless steel gas tube and low-profile adjustable gas block allow you to dial in the right amount of gas for your specific setup. This adjustability improves reliability with different ammunition loads and reduces felt recoil when paired with a heavier buffer system on the lower receiver.

Build Configuration Notes

BCG and charging handle are not included. You will need to source these components separately to complete the upper assembly.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. BCG and charging handle are not included. Verify suppressor compatibility before mounting any device.