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

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

The Hyperion is a complete AR-15 pistol build kit that combines a short-barreled upper with all the components needed to finish a lower receiver. You get a nitride 4150 barrel, drop-in quad-rail handguard, complete bolt carrier group, charging handle, lower parts kit, buffer system, and a Magpul BTR stabilizing brace. This is a full-featured pistol platform ready for configuration.

Key Features

• 10.5" nitride 4150 chrome moly barrel with 1:8 twist rate for 5.56 NATO
• 7" quad-rail Picatinny handguard with drop-in fit
• Complete bolt carrier group and charging handle included
• Magpul BTR pistol brace for added control and stability
• Six-prong steel muzzle brake with crush washer
• Lower parts kit with mil-spec components
• Carbine-length gas system with fixed A2-style front sight base
• Full buffer system including tube, buffer, spring, castle nut, and end plate

Perfect For

• Shooters building a short-range tactical pistol platform
• Home defense configurations in compact form factor
• Pistol competitors looking for a complete upper and lower build
• Builders who want mil-spec reliability without assembly hassle
• Shooters in restricted jurisdictions needing a short-barreled option

Complete Build Kit Included

This kit includes the upper assembly with barrel and handguard, bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, castle nut, and end plate. You'll need to source a stripped lower receiver to complete the build. The Magpul BTR brace provides stable support during operation and is designed for mil-spec carbine buffer tubes.

Quad-Rail Platform and Accessory Mounting

The 7-inch quad-rail handguard gives you full Picatinny coverage on all four sides, making it easy to mount lights, lasers, grips, or other tactical accessories. The drop-in design means no permanent modifications to the upper receiver. The rails maintain consistent zero potential for mounted optics and accessories.

Nitride Barrel and Durability

The 10.5" barrel is made from 4150 chrome moly vanadium steel with a nitride finish, which provides corrosion resistance and extended barrel life. The 1:8 twist rate stabilizes a wide range of 5.56 ammunition from lighter rounds to heavier loads. The fixed A2-style front sight base serves as both a gas block and sight platform.

Short Pistol Platform Advantages

A 10.5" barreled pistol gives you maneuverability in tight spaces while maintaining velocity and accuracy at typical pistol distances. The carbine-length gas system is tuned for this barrel length to ensure reliable cycling. The six-prong muzzle brake helps manage recoil and can accept suppressors with appropriate adapters.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify local regulations regarding pistol braces and short-barreled rifle configurations before assembly.