Radian Weapons R0436 Model 1 Builder Kit 8.50" Magpul M-LOK Handguard

The Radian Weapons R0436 Model 1 Builder Kit with 8.50" Magpul M-LOK handguard is engineered for shooters and gunsmiths who demand modularity, precision, and professional-grade performance. This complete upper receiver kit serves law enforcement, military personnel, and serious civilian operators building or upgrading AR-platform rifles. The Radian Model 1 platform has proven itself in demanding environments where reliability and component quality are non-negotiable.

Built on Radian's reputation for tight tolerances and superior machining, this builder kit features a forged upper receiver paired with an 8.50-inch barrel and the versatile Magpul M-LOK handguard system. The M-LOK mounting standard allows seamless integration of tactical accessories—lights, grips, bipods, and rail panels—without rail congestion or unnecessary weight. The 8.50-inch barrel profile balances velocity, handling characteristics, and configurability, making it suitable for intermediate rifle roles from carbine work to designated marksman applications. All components are precisely finished and assembled to Radian's exacting standards, ensuring reliable function and consistent shot placement.

This kit benefits build-focused operators, armors, and shooters who understand component selection and want factory-backed quality without paying for a complete rifle. Installation requires standard AR tools and basic gunsmithing knowledge; compatibility is assured across standard AR-15 lower receivers and platforms. The 5.48-pound configuration maintains practical weight discipline while delivering the structural rigidity necessary for duty and precision shooting, making it ideal for patrol carbines, home-defense platforms, and training builds where performance matters.