*CONTACT US FOR A SPECIAL COUPON CODE*
Radian Weapons Model 1 Complete Upper Receiver Group 6mm ARC 18" Barrel - Black - R0903 - UPC 810098420952
Product Description
The Radian Weapons Model 1 Complete Upper Receiver Group in 6mm ARC (R0903) delivers match-grade precision, exceptional sub-MOA performance, and extreme long-range ballistic capability in a factory-built AR-15 upper assembly. Chambered in the high-BC 6mm Advanced Rifle Cartridge (6mm ARC) with an 18-inch barrel and a 1:7" twist rate, this complete upper is engineered to maximize velocity, flat trajectory, and energy downrange for precision rifle competition, long-range hunting, and tactical operations.
Precision-machined from 7075-T6 billet aluminum and hand-fitted to ultra-tight tolerances, the Model 1 upper features a contiguous top rail design with Radian's proprietary 17-inch M-LOK handguard. The handguard attaches via a rigid structural interface that completely isolates the free-floated match barrel from bipod and barricade pressure, ensuring absolute point-of-impact stability under heavy field use.
At the heart of the R0903 is the Radian Enhanced Bolt Carrier Group (E-BCG), featuring a self-lubricating suppressor-optimized gas key and enhanced geometry that reduces tilt and drag inside the upper receiver. Upgraded from the factory with a Dead Air KeyMo Muzzle Brake pinned/threaded over rifle-length gas system porting, it tames recoil while offering direct, rock-solid quick-detach suppressor integration. Completed with the suppressor-optimized Radian Raptor-SD ambidextrous charging handle, the R0903 upper is finished in severe-duty Black Cerakote for lifetime corrosion and wear defense.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct fit for all standard mil-spec AR-15 / M4 lower receivers. Note: Requires 6mm ARC / 6.5 Grendel pattern magazines (Type 2 / 0.125" bolt face depth) for proper feeding and operation.
- Verify host lower receiver is completely clear, safe, and unloaded before installation.
- Push host lower receiver pivot and takedown pins out, align the Radian Model 1 upper receiver lugs into the lower receiver, and push pins firmly back through.
- Ensure the rifle-length gas system is paired with a standard carbine or H1/H2 buffer setup depending on ammo load and suppressor backpressure; perform a thorough function test prior to live fire.
Key Features
- Match-Grade 6mm ARC Performance: 18-inch precision barrel with a 1:7" twist rate stabilizes heavy, high-BC 6mm projectiles for extended long-range accuracy.
- Radian Enhanced Bolt Carrier Group (E-BCG): Features self-lubricating geometry and enhanced gas routing to ensure flawless cycling under high volume or suppressor use.
- Raptor-SD Ambidextrous Charging Handle: Suppressor-optimized ported shaft vents blowback gases away from the shooter's face during silenced fire.
- 17" Free-Float M-LOK Handguard: Proprietary rigid handguard mounting architecture isolates the barrel from exterior barricade loads.
- Dead Air KeyMo Muzzle Brake: Reduces muzzle climb and felt recoil while serving as a direct mount for Dead Air KeyMo compatible suppressors.
- Rifle-Length Gas System: Delivers an exceptionally smooth recoil impulse and lower cyclic wear on internal components.
- Black Cerakote Finish: Severe-duty ceramic coating provides maximum abrasion resistance, chemical defense, and corrosion protection.
Product Specifications
- Brand: Radian Weapons
- Model: Model 1 Complete Upper Receiver Group
- MPN / SKU: R0903
- UPC: 810098420952
- Caliber: 6mm ARC (Advanced Rifle Cartridge)
- Barrel Length: 18.0 inches
- Twist Rate: 1:7" Right-Hand Twist
- Gas System: Rifle-Length Gas System
- Muzzle Device: Dead Air KeyMo Muzzle Brake (5/8"-24)
- Handguard: 17.0" Radian M-LOK Free-Float Handguard
- Charging Handle: Radian Raptor-SD Ambidextrous Suppressor Charging Handle
- BCG: Radian Enhanced Bolt Carrier Group (E-BCG)
- Finish: Black Cerakote
- Mass: ~4.8 lbs (2.18 kg)
