Rock River Arms LAR-15M .458 SOCOM 16" Upper
Complete upper receiver in .458 SOCOM with 16" chrome moly bull barrel, forged A4 receiver, 13" M-LOK handguard, and Beast Brake. Includes bolt carrier group and charging handle.
Rock River Arms LAR-15M .458 SOCOM Upper Receiver
This complete upper receiver assembly delivers serious stopping power in the .458 SOCOM cartridge—a proven round for hunting and defensive applications where maximum energy transfer matters.
Key Features
Barrel & Action
- 16-inch chrome moly bull barrel with 1:14 twist rate
- Forged A4 upper receiver for durability and precision
- Low-profile gas block for a clean sight line
Handguard & Ergonomics
- 13-inch extended M-LOK compatible free-float rail
- Lightweight aluminum construction reduces overall weight
- M-LOK slots accept a wide variety of tactical accessories
Muzzle System
- RRA Beast Brake with 5/8x32 threading
- Designed to manage recoil and muzzle rise in this powerful caliber
What's Included
- Bolt carrier group assembly
- Charging handle
- Ready to pair with your AR-15 lower receiver
Why This Upper Matters
The .458 SOCOM is purpose-built for hunters and shooters who demand terminal performance. This upper combines Rock River Arms' manufacturing precision with a proven platform. The bull barrel delivers consistent accuracy, while the extended handguard provides mounting options for optics, lights, and other gear. Whether you're building a specialized hunting rifle or a defensive carbine, this upper gives you a solid foundation.
