The Rock River Arms CAR A4 Complete Upper Receiver is chambered in .350 Legend and built for shooters who demand reliability, precision, and versatility from their AR-15 platform. This complete upper features a 16-inch chrome moly steel barrel with a 1:16 twist rate, threaded at 1/2-36 TPI and fitted with the RRA Operator Muzzle Brake to reduce felt recoil and improve follow-up shot accuracy. The forged aluminum A4 flat-top upper receiver pairs with an RRA 13-inch Extended Lightweight Free Float M-LOK Handguard, offering a full-length Picatinny top rail and M-LOK accessory slots along the handguard for bipods, foregrips, lights, and more. A low-profile gas block and carbine-length gas system round out the reliable operating package. Delivered ready to mount on any mil-spec AR-15 lower receiver, this upper includes a bolt carrier group, charging handle assembly, and one 10-round magazine, making it an outstanding option for completing a build or swapping calibers with ease.
Product Highlights
- .350 Legend Chambering: Versatile and hard-hitting cartridge ideal for hunting and range shooting, compatible with standard AR-15 lower receivers.
- 16" Chrome Moly Barrel: 1:16 twist rate barrel delivers consistent accuracy and durability with the RRA Operator Muzzle Brake (1/2-36 thread) for recoil reduction.
- RRA 13" Extended Lightweight Free Float M-LOK Handguard: Aluminum free-float design with M-LOK slots and full-length Picatinny top rail for easy accessory customization.
- Complete Ready-to-Attach Package: Includes bolt carrier group, mil-spec charging handle assembly, and one 10-round magazine for immediate use.
- Forged Aluminum A4 Flat-Top Upper Receiver: Matte black anodized finish, carbine-length gas system with low-profile gas block, fits mil-spec AR-15 lower receivers.
Specs
- Brand: Rock River Arms
- Manufacturer Part Number (MPN): 350L0328
- UPC: 842834124589
- Caliber: .350 Legend
- Barrel Length: 16 inches
- Barrel Material: Chrome Moly Steel
- Twist Rate: 1:16
- Muzzle Device: RRA Operator Muzzle Brake, 1/2-36 Thread
- Gas System: Carbine Length with Low Profile Gas Block
- Upper Receiver: Forged Aluminum A4 Flat Top
- Handguard: RRA 13" Extended Lightweight Free Float M-LOK
- Rail: Full Length Picatinny Top Rail
- Finish: Matte Black Anodized
- Includes: Bolt Carrier Group, Charging Handle Assembly, (1) 10-Round Magazine
- Compatible With: Mil-Spec AR-15 Lower Receivers
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