Not many companies do the .458 SOCOM Upper right for the AR15 but Rock River and Tromix are two that you can rely on using authorized reamers and RRA does so at an excellent value. Whether Hunting or Home Defense, the .458 is the large cartridge for the AR-15 that hits that sweet spot between improved stopping power without breaking the bank.
The .458 SOCOM was developed for special forces to meet the need of massive punch in close quarters battle. The .458 cartridge is battle tested with rave reviews of it's stopping power effectiveness and is easily suppressed. With readily available reasonably priced cartridges, the 350gr .458 also beats other big bore AR cartridge performance soundly within 75 yards and has an effective range of 200 yards. Expect 1800 ft/lbs of energy from the .458 SOCOM as opposed to 1300 fl/lbs with typical 300BLK ammo.
The .458 can be used in standard AR15 5.56 magazines and a standard 20-round 5.56mm NATO magazine can hold seven .458 SOCOM rounds, while a standard 30-round 5.56mm NATO magazine can hold ten .458 SOCOM rounds.
SOC0370 WITH 16 INCH CHROME MOLY BULL BARREL SPECS:
CALIBER: .458 SOCOM Chamber
UPPER RECEIVER: Forged A4
BARREL: 16-inch Chrome Moly Bull Barrel, 1:14 Twist
MUZZLE DEVICE: A2 Flash Hider / 5/8–32 Thread
GAS BLOCK: Low Profile Gas Block
HANDGUARD: RRA Lightweight Free Float Rail, 13 Inch Extended, MLOK Compatible
INCLUDES: Bolt Carrier Group and Charging Handle Assembly
Lifetime Warranty: Yes