Davidson Defense Last Signal 7.5-inch 1:16 .45 ACP AR-45 Freefloat M-Lok Handguard Pistol Upper Build Kit

Last Signal 7.5 Inch 1:16 .45 ACP AR-45 Freefloat M Lok Handguard Pistol Upper Build Kit

The Last Signal 7.5 inch upper build kit delivers a .45 ACP setup built around a Bear Creek 7.5 inch M4 contour barrel with 1:16 twist and phosphate finish. The 7 inch freefloat M Lok handguard provides modular mounting surfaces while maintaining a lightweight profile. This upper build kit includes the Vertex billet upper assembly with barrel, handguard, and KAK Industry .45 ACP compensator. BCG and charging handle are not included.

Key Features

• Bear Creek 7.5 inch M4 contour barrel, 4150 CrMoV steel, phosphate finish, 1:16 twist rate, .45 ACP chambered
• Davidson Defense Vertex Enhanced billet upper receiver, 6061 T6 aluminum, Type III hard coat anodized finish
• 7 inch freefloat M Lok handguard, aluminum construction, black finish
• KAK Industry .45 ACP compensator, .578x28 thread pitch
• .45 ACP caliber, AR-45 platform

Perfect For

• AR-45 builders seeking upper build kit for .45 ACP
• Shooters wanting large bore pistol caliber carbine upper
• Compact defensive applications requiring stopping power
• Builders preferring billet upper receiver with Type III hard coat anodizing

Bear Creek M4 Contour Barrel

The Bear Creek 7.5 inch barrel features 4150 CrMoV steel construction with phosphate finish. The M4 contour profile provides appropriate rigidity while balancing weight in a compact package. Phosphate finish provides corrosion resistance and durability through a phosphate conversion coating. The 1:16 twist rate stabilizes standard .45 ACP projectiles effectively. The .578x28 thread pitch accepts .45 ACP specific muzzle devices including the included KAK Industry compensator.

.45 ACP Caliber Configuration

The .45 ACP chambering provides large bore pistol caliber performance in an AR platform. The 7.5 inch barrel length provides optimal velocity for .45 ACP while maintaining compact dimensions. This caliber offers substantial stopping power in a manageable platform suitable for defensive applications.

Vertex Enhanced Billet Upper Receiver

The Davidson Defense Vertex Enhanced billet upper receiver is machined from 6061 T6 aluminum with Type III hard coat anodized finish. Type III hard coat anodizing provides enhanced surface hardness and wear resistance compared to standard anodizing. Billet construction allows for tighter machining tolerances compared to forged receivers and enables unique design features optimized for pistol caliber operation. The enhanced design accommodates .45 ACP specific components and magazines.

KAK Industry .45 ACP Compensator

The KAK Industry .45 ACP compensator redirects propellant gases to reduce muzzle rise and felt recoil. The .578x28 thread pitch is specific to .45 ACP barrels. Compensators improve control during rapid fire by counteracting the natural upward rotation of the muzzle. This compensator enhances follow up shot speed in defensive scenarios.

Freefloat M Lok Handguard System

The 7 inch freefloat M Lok handguard extends nearly to the muzzle device, maximizing usable mounting length without adding bulk. M Lok slots allow modular accessory attachment while maintaining a slim profile. Aluminum construction keeps weight manageable on a compact platform.

Upper Build Kit Components

This upper build kit includes the Vertex billet upper assembly with barrel and handguard, and KAK Industry .45 ACP compensator. BCG and charging handle are not included. Compatible with AR-45 lower receivers when paired with .45 ACP specific magazines and bolt carrier group. The inclusion of the caliber specific compensator provides immediate recoil control benefits.

Follow safe handling and manufacturer instructions. BCG and charging handle are not included. Requires .45 ACP specific bolt carrier group and magazines compatible with AR-45 platform. Ensure compatibility with your lower receiver, bolt carrier group, and magazine system. Ensure compliance with all applicable laws.