Rock River Arms Tactical Carbine, 16″ Barrel, RRA 15″ Free Float M-LOK Handguard, Black

Product Description

The Rock River Arms 458 SOCOM tactical carbine upper receiver delivers serious stopping power in a modern, modular platform. This complete upper assembly fits standard AR-15 platforms and includes everything you need for immediate deployment.

Additionally, the 16″ barrel paired with the RRA Operator Muzzle Brake provides excellent accuracy and recoil management. Furthermore, the 15″ free float M-LOK handguard gives you unlimited rail real estate for optics, lights, and accessories. The anodized black finish resists corrosion and wear.

Complete Package Includes

This RRA CMPLT CAR A4 UPR 458 SOCOM comes fully assembled with a bolt carrier group and charging handle. Therefore, you avoid compatibility headaches and get to the range faster. The upper receiver arrives inspection-ready and function-tested from the factory.

Moreover, the 458 SOCOM cartridge offers superior ballistics for medium to long-range target work and training scenarios. Indeed, many shooters choose this upper for caliber conversion projects because it maintains AR-15 ergonomics while delivering magnum-class performance. The tactical carbine design excels in both precision shooting and dynamic training environments.

Ideal for Shooters Seeking Versatility

Whether you’re building a dedicated 458 SOCOM rifle or converting an existing lower receiver, the Rock River Arms upper delivers reliability and accuracy. Similarly, trainers and competitive shooters appreciate the multi-platform versatility this upper receiver provides. The complete assembly eliminates guesswork during build-outs.

Available at Western Sport – Roanoke, TX

Western Sport is a licensed FFL/SOT dealer serving the North Texas and DFW area since 2007. We stock premium tactical uppers like the Rock River Arms 458 SOCOM and provide expert guidance on caliber conversion and compatibility. Contact us at 817-393-4000 to reserve yours or discuss your build requirements.

Why Buy from Western Sport?

• Licensed FFL/SOT dealer with 15+ years of North Texas firearm expertise.
• Competitive pricing on premium brands like Rock River Arms.
• Fast, knowledgeable transfers and local service you can trust.
• Expert staff ready to advise on upper receiver compatibility and caliber conversions.
• Strong after-sale support and community reputation in the DFW area.

Frequently Asked Questions

Q: Does this Rock River Arms upper fit my AR-15 lower receiver?

A: Yes, the RRA CMPLT CAR A4 UPR 458 SOCOM is designed for standard AR-15 lower receivers. The upper uses mil-spec dimensions and interfaces with any properly finished AR-15 lower. Compatibility is seamless for caliber conversion builds.

Q: What warranty does Rock River Arms provide on this upper?

A: Rock River Arms stands behind every firearm component with a solid manufacturer warranty. Western Sport will help you register your upper with RRA and explain all warranty coverage details. Contact us at 817-393-4000 for complete warranty information.

Q: What is the Texas FFL transfer process for this upper receiver?

A: Upper receivers are not serialized components and do not require FFL transfers in Texas or most states. You can take possession immediately when you purchase from Western Sport in Roanoke. Our team will confirm all local regulations at point of sale.

Q: What is the best use case for the 458 SOCOM caliber?

A: The 458 SOCOM excels at medium to long-range precision shooting, tactical training, and dynamic shooting scenarios. Many shooters use this cartridge for dedicated rifle builds or caliber conversion projects where magnum ballistics meet AR-15 ergonomics. It’s popular with trainers and competitive shooters who value versatility.

Additional information