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10.5" 458 SOCOM Upper AR 15 Assembly Mid Length Rail
10.5" 458 SOCOM Upper AR 15 Assembly Mid Length Rail

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List Price: $599.99
Our Price: $429.99
Savings: $170.00

Quantity in Stock:45
Product Code: 105458CMU1X1KMMLR

Choose A Different Muzzle Device*:

Add Magazine:

Add Bolt Carrier Group:

Add Charging Handle:

Add a Picatinny Rail Section*:

Description Additional Info

10.5" 458 SOCOM Upper AR 15 Assembly Mid Length Rail

*Milspec forged aluminum upper receiver with forward assist and dust cover assembly installed. Matte black hard coat anodized Mil 8625 Type 3 Class 2. One large single Feed Ramp for big bore cartridges. Forged from 7075 T6 aluminum. This receiver has been correctly modified around the ejection port to allow for clearance and proper ejection of the 458 SOCOM cartridge.

*AR15Part.com 10" Mid Length Narrow Profile Free Float Rail. Very comfortable and very light weight. Keymod slots run the entire length of our rail at the 3, 6, and 9 o'clock postions. Keymod compatible picatinny rail sections NOT included but are available for purchase on our website if needed. Keymod compatible picatinny rail sections easily attach to our rails for adding accessories like bipods, flash lights, grips, lasers, etc.

*ER SHAW CUSTOM 10.5” 458 Socom 416R Stainless Steel Barrel with 1x14 twist and 5/8x32 Muzzle Threads. ER Shaw barrels are extremely accurate, high performance barrels with a long, exceptional reputation for quality.

*.875 low profile gas block.

*Pistol Gas Tube.

*Compact competition muzzle brake with crush washer.

*It is HIGHLY recommended to run this upper with a D&H Tactical 458 Socom Magazine for zero feed issues and our 458 bolt carrier group. It is a 458 Socom bolt carrier group with a genuine 458 Socom bolt assembly. It is highly recommended to use our brand bolt with 458 Socom uppers/barrels to eliminate feeding and extraction issues that are common to 458 Socom's that do not use this bolt. Our 458 Socom bolt assembly has MANY specific, unique and purposeful features about it that other brand 458 Socom bolts do not have. These features are absolutely critical for reliable, consistent performance in 458 Socom uppers. We have them available for purchase on our website.

*This upper assembly will fit all standard AR 15 lower receivers


This item IS NOT A FIREARM!!! It is only "Firearm Parts", so no FFL is needed and it can be shipped directly to you. You are responsible for knowing your state or local laws. We will not ship this item to areas where it is not legal to own..



    .458 SOCOM rifles and upper halves should always be loaded from a magazine. Do not load singly through the ejection port, a slam fire can occur upon bolt release.

    .458 SOCOM rifles and upper halves should only be fed from aluminum magazines. Polymer magazines can swell and rounds can shift creating opportunities for misfeeds, jams, and other issues that don’t occur with the aluminum mags.

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 1 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Great product January 18, 2021
Reviewer: Ronnie Thompson from West Columbia , TX United States  
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