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16" 458 SOCOM Stainless Barrel
12" Rail - Competition Muzzle Brake
AR15 Rifle Upper Assembly

16" 458 SOCOM Upper AR15 Assembly Rifle Length Rail

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List Price: $580.00
Our Price: $460.00
Savings: $120.00

Quantity in Stock:(Out of Stock)
Product Code: 16458CMU1X14MLMLR

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Add Bolt Carrier Group:

Add Charging Handle:

Add a Picatinny Rail Section*:


16" 458 SOCOM Upper AR 15 Assembly Rifle 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 12" Rifle Length Narrow Profile Free Float Rail. Very comfortable and very light weight. M Lok slots run the entire length of our rail at the 3, 6, and 9 o'clock postions. M Lok compatible picatinny rail sections NOT included but are available for purchase on our website if needed. M Lok compatible picatinny rail sections easily attach to our rails for adding accessories like bipods, flash lights, grips, lasers, etc.

*ER SHAW CUSTOM 16” 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.

*Carbine 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: 63 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Excellent April 8, 2021
Reviewer: Philip from Dixie  
I have purchased a number of uppers from these folks and all have been perfect. well made and accurate

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  0 of 0 people found the following review helpful:
5 of 5 Great Build! April 2, 2021
Reviewer: Max P from DANE, WI United States  
Shoots great build great and awesome prices! Whats not to love. They have accurate inventory counts and ship fast.

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  0 of 0 people found the following review helpful:
5 of 5 458 SOCOM upper October 27, 2020
Reviewer: Shawn W from NV United States  
Great purchase,  fast service.  I had a question and the support staff was on it!!!  I look forward to ordering from these professionals again.

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  0 of 0 people found the following review helpful:
3 of 5 Cycling issue October 16, 2020
Reviewer: Weston Barton from Acworth, GA United States  
Upper and barrel are top notch. The bcg is not so great tho. Very very tight and causing issues.

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  0 of 0 people found the following review helpful:
5 of 5 Very happy!! October 10, 2020
Reviewer: Joshua from Baskerville, VA United States  
Fast shipping! Very happy with my purchase. Fired very well. Using the 4 round magazine I ordered along with the upper and some old metal military mags I had it ran flawless. No feeding issues at all and very tight groupings right out of the box. Would highly reccommend giving this a go. You wont be disappointed.

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