AR-15 .458 SOCOM 18" 4150 CMV Upper Assembly – 15" M-LOK

.458 SOCOM Upper: Specs & Features

AR-15 .458 Socom 18" 4150 CMV Upper Assembly / 15" Mlok  . This upper assembly is compatible with .458 Socom cartridges, making it suitable for big game hunting and tactical shooting. It is made from 4150 Chromoly Vanadium (CMV), a high strength steel that offers increased strength, corrosion resistance, and wear resistance. This AR-15 .458 Socom upper assembly features an 18-inch barrel which is long enough to deliver impressive velocity, and yet compact enough to offer improved maneuverability. The barrel is also outfitted with a muzzle brake, designed to reduce the felt recoil and muzzle rise, giving the shooter better control, quick follow-up shots and decreased shooter fatigue.This assembly comes with a 15 Mlok, which provides an effective platform for attaching accessories such as lights, lasers, and forward grips. This upper assembly is known as a drop-in design because it can be easily installed on any standard AR-15 lower assembly, with no additional gunsmithing required. Make sure to enhance your lower with 4.3 heavy buffer for maximum performance. Whether you're building a new AR-15 from scratch or upgrading your existing rifle, this AR-15 .458 Socom upper assembly is a powerful and reliable choice.

Barrel - 18" 4150 heavy barrel chambered in .458 Socom. Single Feedramp. Button rifled with 1-14 rh twist. .875 under gas block diameter. Threaded 5/8x32. Mid- length gas system. Barrel is finished off by linear compensator in hardened steel construction. 

A3 flat top upper receiver - made from certified 7075-T6 aluminum forgings. Black hardcoat anodized to Gov. Specs. Forward assist and dust cover installed. Socom style to allow for big bore cal ejector.

Gas system - .875 low profile gas block, made from steel, nitride coated.  Mid-length gas system.

Handguards - 15" Rifle-length Mlok free float rail. Made from aircraft quality aluminum and black hard coat anodized. 

Does not come with BCG or Charging Handle. Can be purchased separately. 

NOTE: Images may not be an exact representation of the product. Compatible with Big Bore Mil Spec AR-15 Lower Receivers adjusted with 4.3 oz buffer for proper cycling.

FAQ

Will this upper fit my AR-15 lower?

Yes. It fits a standard mil-spec AR-15 lower receiver.

What bolt and magazines do I need?

A dedicated .458 SOCOM bolt carrier group. It feeds from standard AR-15 magazines in a single stack, so capacity is lower than with 5.56.

Related: .458 SOCOM uppers · all AR-15 upper assemblies