The Radian Weapons Model 1 Builder Kit (part no. R0406) bundles a billet upper receiver and AX556 lower receiver with a 15.5-inch Magpul M-LOK handguard, giving builders a matched set of core AR-15 components sized for a longer-handguard rifle build. The kit includes a full set of ambidextrous controls, from the charging handle to the safety selector, so left- and right-handed shooters get the same fast manual of arms. It is built for shooters who want a proven, fully ambidextrous AR-15 platform with extra rail space for accessories.

Key Specifications

• Includes a billet upper receiver with dust cover, anti-rotation pin, and lightweight forward assist installed.
• Paired with the Radian AX556 lower receiver for a matched upper/lower set.
• Fitted with a 15.5-inch Magpul M-LOK handguard for extended accessory and light mounting space.
• Includes the Raptor-SD ambidextrous charging handle for fast, snag-free manipulation.
• Equipped with the Radian Talon 45/90 ambidextrous safety selector.
• Includes an ambidextrous bolt catch and release and an ambidextrous magazine release.
• Comes with an enhanced takedown pin set, aluminum barrel nut, and barrel nut wrench.

Frequently Asked Questions

What parts are included in this kit? A billet upper receiver, AX556 lower receiver, 15.5-inch M-LOK handguard, ambidextrous charging handle, safety selector, bolt catch and release, magazine release, takedown pin set, barrel nut, and barrel nut wrench.

Why choose the 15.5-inch handguard over a shorter option? The longer handguard gives you more M-LOK rail space for lights, grips, and other accessories on a longer-barrel build.

Are the controls ambidextrous? Yes, the charging handle, safety selector, bolt catch/release, and magazine release are all ambidextrous.

Buy the Radian Weapons Model 1 Builder Kit with 15.5-inch Magpul M-LOK Handguard

Order this Radian Weapons Model 1 builder kit from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and build on a fully ambidextrous AR-15 platform with room to spare. Browse our full selection of AR15 lower receivers for more build options.