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

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List Price: $589.99
Our Price: $299.99
Savings: $290.00

Availability:: Usually Ships in 24 to 72 Hours
Product Code: 105458CMU1X14MLMLR

Add A Magazine*:

Choose A Different Muzzle Device*:

Choose Keymod or M Lok Slots*:

Bolt Carrier Group:

Charging Handle:

Color of Upper Receiver ONLY:

Description Additional Info

10.5" 458 SOCOM Pistol 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. 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.

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

*10.5" 458 SOCOM 416R Stainless Steel Barrel with 1x14 twist. Heavy Contour with 5/8x32 muzzle threads. Proper single feed ramp for 458 SOCOM cartridge.

*.936 low profile gas block.

*Pistol Length 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 a TROMIX bolt carrier group. It is a 458 Socom bolt carrier group with a genuine Tromix brand bolt assembly. It is highly recommended to use this 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. The Tromix 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: 5 of 5 Total Reviews: 1 Write a review »

  0 of 0 people found the following review helpful:
Seriously awesome. March 10, 2019
Reviewer: Nathaniel Tindall from Oregon.  
Always wanted to build a big bore AR. I was very pleased with the quality of the upper and a good price. Very happy with the results. Can’t wait to shoot it once my forarm brace shows up.

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