Radian Model 1 Builder Kit ODG

Description

Radian Model 1 Builder Kit ODG

The Radian Weapons Builder Kit gives a builder a matched billet foundation, not a parts-bin gamble. Radian machines the upper, handguard, and AX556 lower together as one set. As a result, the fit lines up like a factory rifle. That means none of the guesswork a mixed-and-matched build often brings. The upper starts as billet 7075-T6 aluminum. It arrives with the dust cover, anti-rotation pin, and lightweight forward assist already in place. Because of this, there’s one less subassembly to fit by hand. The AX556 lower ships fully ambidextrous. Since it does, left-handed shooters get the same ergonomics right-handed shooters expect. No aftermarket workaround required.

The 15.5″ handguard runs a Magpul M-LOK interface. It locks to the included aluminum barrel nut with four steel cross bolts, finished in black nitride. As a result, accessory mounting stays rigid instead of loosening under recoil. A Raptor-SD ambidextrous charging handle, a Radian Talon 45/90 safety selector, an ambidextrous bolt catch and release, and an ambidextrous mag release all come standard. This kit only needs a barrel, BCG, and lower parts kit to finish the build. Radian hand-smooths and blends every edge on the upper and handguard. Furthermore, the set ships finished in Radian OD Green Cerakote for a matched look. This is a receiver set. Because of this, it ships and transfers as a firearm through your FFL, just like any other AR-15 receiver.

Key Features — Radian Weapons Builder Kit

• Radian machines the upper and handguard as a matched pair. As a result, the billet 7075-T6 aluminum upper arrives with the dust cover, anti-rotation pin, and forward assist pre-installed
• 15.5″ M-LOK handguard, machined alongside the upper receiver for a matching fit
• Radian AX556 billet lower receiver; every control runs ambidextrous, so left- and right-handed shooters get the same ergonomics
• Raptor-SD ambidextrous charging handle, built specifically for suppressor use
• Additionally, the Radian Talon 45/90 ambidextrous safety selector ships standard
• Ambidextrous bolt catch and release, plus an ambidextrous magazine release
• Enhanced takedown pin set, which speeds up disassembly and reassembly at the bench
• Aluminum barrel nut and barrel nut wrench included, so there’s one less part to source
• 4x M-LOK handguard cross bolts, washers, and nuts, finished in black nitride
• Furthermore, the Radian OD Green Cerakote finish covers the upper receiver and handguard
• 5.8 lb shipping weight as packaged

 

Why This Product Stands Out

Most builders start with an upper from one manufacturer and a lower from another. Then they spend time fitting the two together, hoping the tolerances cooperate. Radian sidesteps that entirely. Because it machines the upper and handguard as a matched pair, the fit is already dialed in before the box even opens. That matters most on a build where every other part, from barrel to BCG, still needs selecting and installing.

Every major control runs ambidextrous from the factory. Because of this, the kit never forces a left-handed shooter into an aftermarket safety, charging handle, or mag release swap. Radian built the Raptor-SD charging handle specifically with suppressor use in mind. A builder running a can from day one avoids fighting gas blowback with a standard handle. Similarly, the enhanced takedown pin set and hand-smoothed edges are details a shooter only notices after months of range time — not on build day.

Anyone who has built an AR-15 from a generic parts kit will notice the difference immediately. Mil-spec tolerances rarely match Radian’s billet-matched fit the moment the upper and lower pin together. That fit, combined with ambidextrous controls out of the box, is why builders keep returning to Radian receiver sets instead of chasing parts from multiple brands.

Ideal Use Cases

• Ground-up custom AR-15 build
• Upgrading from a mil-spec parts kit, since this set adds a billet-machined, fully ambidextrous platform
• Suppressor-focused builds, given that Radian built the Raptor-SD charging handle for it
• Competition or duty-oriented rifle builds that specifically require ambidextrous controls

 

Technical Specifications

Because this kit ships as a receiver set rather than a complete rifle, the table below reflects verified components only — no barrel, action, or caliber-specific specs apply until the build is finished.

 

Compatibility Information

Handguard / Rail Compatibility: The 15.5″ handguard runs a Magpul M-LOK interface. As a result, it accepts any standard M-LOK accessory, including lights, grips, and bipods.

Lower Parts Kit Compatibility: The safety selector, bolt catch and release, and magazine release all come standard on the AX556 lower. Since those are pre-installed, a standard AR-15 lower parts kit only needs to supply the trigger group, springs, and detents.

Barrel and BCG Compatibility: The upper accepts any standard mil-spec AR-15 barrel and bolt carrier group. Because of this, builders are not locked into a proprietary spec. The included barrel nut and wrench match the handguard’s mounting interface.

Magazine Compatibility: The AX556 lower runs a standard AR-15 magazine well. Because of this, it accepts standard STANAG-pattern AR-15 magazines without modification.

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TX Arms Lifetime Warranty

This firearm is covered under our TX Arms Lifetime Warranty

Manufacturer: Radian Weapons | Model: Model 1 Builder Kit | Type: Receiver | Caliber: AR-15 Platform (Multi-Caliber) | UPC: 817093022594 | SKU: RWR0407

THIS FIREARM REQUIRES TRANSFER THROUGH A LICENSED FFL DEALER. ALL APPLICABLE FEDERAL, STATE, AND LOCAL LAWS APPLY.