Davidson Defense Whitecap 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, 1:8, w/ SBA5 Brace

Whitecap 10.5" 5.56 NATO AR-15 Pistol Build Kit, 7" Quad Rail, 1:8, w/ SBA5 Brace

This is a complete 5.56 NATO AR-15 pistol build kit featuring a 10.5" nitride 4150 chrome moly barrel, seven-inch quad-rail handguard, SB Tactical SBA5 stabilizing brace, and mil-spec components throughout. The kit includes everything except the lower receiver, giving you a straightforward path to a compact, highly configurable platform.

Key Features

• 10.5" nitride 4150 chrome moly barrel with 1:8 twist rate and M4 profile
• Seven-inch four-sided Picatinny quad-rail handguard for accessory mounting
• Carbine-length gas system with A2-style front sight base
• Complete mil-spec bolt carrier group with 8620 alloy steel carrier, nitride finished
• SB Tactical SBA5 stabilizing brace with six-position adjustability
• Complete mil-spec lower parts kit with standard carbine buffer tube and spring
• Standard A2 GI birdcage flash hider with crush washer
• Mil-spec charging handle and receiver end plate included

Perfect For

• Builders seeking a compact 5.56 platform with minimal barrel length
• Home defense setups requiring maneuverability in tight spaces
• Shooters who want quad-rail modularity for optics and accessories
• Pistol brace users prioritizing adjustability and control
• Builders starting with a stripped lower receiver they already own

SBR Ready Configuration

This kit ships without a brace installed and is configured for customers selecting their own final setup. The SBA5 brace is included and designed to attach to the mil-spec carbine buffer tube, but the configuration remains flexible based on your specific build requirements. This approach allows you to customize the stabilizing brace position and angle to match your shooting style and handling preferences.

Quad-Rail Modularity

The seven-inch quad-rail handguard provides full 360-degree Picatinny rail coverage, letting you mount lights, lasers, vertical grips, and other accessories exactly where you need them. The rails are machined from 6061-T6 aluminum and anodized for durability. The quad-rail design works with standard AR-15 accessory mounts, giving you flexibility to adapt the kit as your needs change.

Carbine-Length Gas System

The carbine-length gas tube and A2-style front sight base create a proven, reliable cycling system for 5.56 NATO ammunition. This configuration has been field-tested across millions of builds and delivers consistent reliability without requiring tuning or adjustment. The front sight base also serves as your gas block, simplifying the upper assembly while maintaining standard AR-15 compatibility.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. SB Tactical SBA5 brace is included and configured for mil-spec carbine buffer tubes.