Davidson Defense Aegis Lightweight 10.5" 5.56 NATO AR-15 Pistol Build Kit, M-Lok, 1:8, w/ SBA3 Brace

Aegis Lightweight 10.5" 5.56 NATO AR-15 Pistol Build Kit, M-Lok, 1:8, w/ SBA3 Brace

This is a complete upper and lower assembly package built on proven AR-15 fundamentals. You get a 10.5-inch 4150 CrMoV barrel with a 1:8 twist rate, a 7075-T6 aluminum upper receiver, and a freefloat M-Lok handguard that keeps your rifle accurate and modular. The SB Tactical SBA3 adjustable stabilizing brace provides support and control, while the carbine-length gas system keeps the action running smooth. Everything arrives as a matched system ready for a lower receiver.

Key Features

• 10.5-inch 4150 CrMoV barrel with 1:8 twist rate for 5.56 NATO
• Freefloat M-Lok handguard allows accessory mounting without affecting barrel harmonics
• 7075-T6 upper receiver with anodized finish for durability
• SB Tactical SBA3 adjustable stabilizing brace with nylon reinforced polymer construction
• 9310 alloy steel bolt carrier group with nitride finish
• Carbine-length gas system with 0.75-inch gas block shelf
• Mil-spec charging handle and AR-15 end plate

Perfect For

• Shooters building a compact 5.56 rifle configuration
• Pistol platform users who want modular upper and lower assembly
• Builders seeking a freefloat system with M-Lok compatibility
• Those prioritizing accuracy in a shorter barrel length

Compact 5.56 Platform

The 10.5-inch barrel with 1:8 twist rate is optimized for 5.56 NATO rounds and delivers reliable performance in a compact package. The carbine-length gas system cycles the 9310 alloy steel bolt carrier group efficiently without excess recoil. This barrel profile and gas configuration work together to maintain velocity while keeping overall length manageable for close-quarters or vehicle use.

Freefloat M-Lok Handguard System

The 6061-T6 aluminum handguard floats freely from the upper receiver, meaning the barrel never touches the rail. This design eliminates harmonic interference and improves shot-to-shot consistency. The M-Lok mounting pattern gives you multiple options for lights, grips, and accessories without adding weight or complexity.

SBA3 Stabilizing Brace Configuration

The SB Tactical SBA3 brace is adjustable and constructed from nylon reinforced polymer for a balance of durability and weight savings. The brace provides support and control during operation. This kit ships with the brace installed and ready to use.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.