The Radian Model 1 Builder Kit in brown with a 14-inch handguard (brand part no. R0413) is the foundation for a custom AR-15 build from Radian Weapons. It pairs a billet upper and the AX556 lower receiver with a 14-inch handguard, finished in brown, so the build starts from matched, CNC-machined parts. The Model 1 line is known for fully ambidextrous controls, and every Radian product is guaranteed for life. It is aimed at the builder who wants a high-end receiver set and the freedom to choose the rest of the rifle.

Key Specifications

• The model is the AX556, the Radian lower receiver at the heart of the kit.
• The kit is a billet upper and lower receiver set, machined as a matched pair.
• The handguard is 14 inches long, a length that suits barrels from the mid-length range up to 16 inches.
• The finish is brown, which sets this kit apart from the other Radian colorways.
• The action is semi-automatic, the standard AR-15 operating style.
• Controls are fully ambidextrous, which serves both right-handed and left-handed shooters.
• The parts are CNC machined, which Radian uses for precise fit between components.
• The kit is covered by a lifetime guarantee, as is every Radian product.
• The platform is AR-15 pattern, so common AR-15 parts and accessories fit the build.

Frequently Asked Questions

How long is the handguard on this kit? The handguard is 14 inches long.

Is this the FDE version? No. This listing is the brown finish, so check the finish name before you order if you want a tan or FDE look.

Are the controls ambidextrous? Yes. Radian builds the Model 1 with fully ambidextrous controls for both right-handed and left-handed shooters.

Buy the Radian Model 1 Builder Kit, 14-Inch Handguard, Brown

A build is only as good as the receivers it starts from, and billet Radian parts are a strong place to start. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more semi-auto rifles while you are here.