Details
Ronin Competition 16-inch .338 ARC Complete Upper
The Ronin Competition 16-inch complete upper delivers a purpose-built .338 ARC platform with a 1:8 twist carbine-gas barrel, freefloat M-Lok handguard, and billet aluminum construction. This upper pairs a 4150 CMV steel barrel with a Black Diamond Series billet receiver and includes a complete bolt carrier group and charging handle. The setup runs a micro low-profile gas block paired to carbine-length gas system tuning, optimized for .338 ARC ballistics and reliable cycling.
Key Features
- 4150 CMV steel barrel with 1:8 twist rate, carbine-gas system, 5/8x24 thread pitch
- Black Diamond Series billet aluminum upper receiver, Type III hard coat anodized finish
- Freefloat M-Lok handguard in 6061-T6 aluminum for accessory mounting flexibility
- Complete bolt carrier group in 9310 alloy steel with nitride finish, designed for 6.5 Grendel II bolt pattern
- Micro low-profile 0.750 O.D. gas block for clean rail integration
- AR-15 M4 mil-spec charging handle and TPI GI birdcage flash hider included
Perfect For
- Shooters building a dedicated .338 ARC rifle platform
- Precision and competition shooters wanting a freefloat upper configuration
- Builders seeking a complete upper assembly with matched barrel and bolt carrier
- Mid-range build projects requiring quality billet construction
.338 ARC Platform Design
The .338 ARC cartridge demands specific barrel twist rates and gas system tuning to perform reliably. This upper's 1:8 twist pairs with carbine-length gas tuning to cycle .338 ARC ammunition consistently while managing recoil impulse. The 6.5 Grendel II bolt pattern compatibility reflects the cartridge's mechanical lineage, allowing proven bolt carrier geometry to function in this intermediate caliber platform.
Freefloat Handguard and Accessory Ecosystem
The M-Lok handguard design floats the barrel independently of the upper receiver, eliminating pressure points that can shift zero. M-Lok slots run the full length of the rail, supporting standard M-Lok accessories like bipods, lights, and grips. The 6061-T6 aluminum construction balances weight and rigidity without adding unnecessary bulk to a 16-inch carbine profile.
Billet Upper Receiver and Gas Block Integration
The Black Diamond Series upper receiver is machined from 6061-T6 billet aluminum and finished with Type III hard coat anodize for corrosion resistance. The micro low-profile gas block mounts cleanly under the handguard without interfering with rail real estate. This configuration maintains sight line clearance and reduces profile while handling carbine-length gas system pressures.
Complete Upper Assembly Contents
This complete upper includes the upper receiver, barrel, handguard, bolt carrier group, charging handle, and flash hider. The bolt carrier group runs 9310 alloy steel with nitride finish for durability. Bolt carrier group and charging handle are matched to AR-15 platform specifications and arrive ready for installation into a compatible lower receiver.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.
