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Tromix 458 SOCOM Upper 16" Barrel Assembly and Tromix Matched 458 Socom Bolt w/ Rifle Length Rail
Tromix 16" 458 SOCOM Complete Upper Assembly Rifle Length Rail

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List Price: $799.99
Our Price: $579.99
Savings: $220.00

Availability:: Usually Ships in 24 to 72 Hours
Product Code: 16458TU1X14MLMLR

Add A Magazine*:

Choose Keymod or M Lok Slots*:

Charging Handle:

Color of Upper Receiver ONLY:

Description Additional Info

Tromix 458 SOCOM Upper 16" Barrel Assembly and Tromix Matched 458 Socom Bolt w/ 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.

*12" Rifle 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.

*Tromix brand 16.25″ Barrel profile is .900″ under the hand guards, .875″ at the gas block, and .800″ at the muzzle. Carbine length gas system. Threaded 5/8-24 with a 1:14 twist. Machined for use with hand guards that don’t use a hand guard cap. Barrel weight: 1.92 lbs. 4150 Carbon Steel.

*Complete 458 Socom BCG Bolt Carrier Group built with a factory Tromix Matched bolt assembly.

*.875 low profile gas block.

*Carbine Gas Tube.

*A2 Flash Hider threaded 5/8x24

*It is HIGHLY recommended to run this upper with a D&H Tactical 458 Socom Magazine for zero feed issues. 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: 2 Write a review »

  0 of 0 people found the following review helpful:
Complete Tromix upper August 20, 2019
Reviewer: William A. from Davison, MI United States  
Extremely fast shipping. Great quality and ready to be put on your lower. I put 100 rounds thru it with zero issues and very accurate.

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  0 of 0 people found the following review helpful:
Great upper February 27, 2019
Reviewer: Harlen J. from Mississippi  
Genuine Tromix barrel for sure.  Fit and function checks out.  Super price too compared to other Tromix 458 uppers.  Happy customer.

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