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The Radian Weapons R0436 Model 1 Builder Kit brings together precision-machined components and thoughtful ambidextrous design in one comprehensive package. This kit pairs a billet upper receiver with the fully featured AX556 ambidextrous lower receiver, giving you the core foundation that separates quality builds from run-of-the-mill AR-15s. Everything is machined from 7075-T6 aluminum with matched Cerakote finishes for a cohesive look.
What You Get in the Box
You're getting a matched upper and lower receiver set with serious attention to detail. The upper comes pre-assembled with a dust cover, anti-rotation pin, and lightweight forward assist already installed. The 8.5-inch Magpul M-LOK handguard sits front and center—compact enough for tight handling but long enough for meaningful accessory mounting. Included are a Raptor-SD ambidextrous charging handle (the ported SD version directs gas away from your face when suppressed), a Radian Talon 45/90 ambidextrous safety, ambidextrous bolt catch and magazine release, enhanced takedown pins, an aluminum barrel nut, and all the necessary mounting hardware.
Why Ambidextrous Controls Matter
Radian's full complement of ambidextrous controls isn't just a spec sheet feature. The dual-sided Raptor-SD gives you smooth charging from either side of the rifle. The Talon safety works from both sides and can be adjusted for 45 or 90-degree throw. The magazine release buttons and bolt catch work for left and right-handed operation without compromise. For left-handed shooters, this eliminates the usual frustrations. For right-handed shooters, it adds flexibility and faster transitions.
Built Like It Means Something
This kit represents the engineering philosophy Radian puts into their Model 1 line: use the best materials, the most precise CNC machinery, and components that actually matter. The billet aluminum receivers have tight tolerances, every edge is chamfered smooth, and the matched finishes make the kit feel like a complete vision rather than a pile of parts. It's a builder kit that doesn't feel cheap or compromised.
This kit is chambered for 5.56 NATO / .223 Remington. The receivers and components are designed for standard AR-15 platforms in this caliber. You'll need to source a barrel separately if you want a different caliber.
Yes. The charging handle, safety selector, bolt catch, and magazine release all work from both sides without requiring conversion or swapping parts. Right-handed shooters benefit from the dual-side charging and faster transition options, while left-handed shooters get full functionality without workarounds.
This kit covers the receivers and upper components, but you'll still need a barrel, bolt carrier group, gas system, lower parts kit, stock, buffer tube assembly, pistol grip, and magazine. Some builders prefer ordering these as separate components for customization; others go for a complete upper assembly to simplify the process.
The SD (suppressor-optimized) version has a ported shaft design that redirects gases down and forward when shooting suppressed, reducing blowback toward your face. If you plan to run your rifle unsuppressed, the standard Raptor still works flawlessly. The large, ambidextrous latches on both sides make charging smooth and intuitive from either side.
Yes, Radian uppers are designed to work with standard mil-spec lowers. That said, pairing the R0436 upper with the included AX556 lower creates a cohesive, precision-matched set with tight tolerances and perfect finish matching—you get the full benefit of Radian's engineering when everything is paired together.
Radian uses billet aluminum construction, precision CNC machining, and rigorous quality control. Their Model 1 receivers come from the same manufacturing philosophy as their complete rifles—each assembly is hand-built by gunsmiths and includes their lifetime guarantee. You're getting components engineered for durability and precise fit.
| UPC | 817093024192 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | R0436 |
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