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16" 458 SOCOM Upper AR 15 Assembly Rifle Length Rail
16" 458 SOCOM Upper AR 15 Assembly Rifle Length Rail

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List Price: $599.99
Our Price: $299.99
Savings: $300.00

Availability:: Usually Ships in 24 to 72 Hours
Product Code: 16458CMU1X14MLMLR

Add A Magazine*:

Choose A Different Muzzle Device*:

Choose Keymod or M Lok Slots*:

Bolt Carrier Group:

Charging Handle:

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Description Additional Info

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.

*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.

*16" 458 SOCOM 4150 Hardened Chrome Moly Steel Barrel with 1x14 twist. Heavy Contour with 5/8x32 muzzle threads. Proper single feed ramp for 458 SOCOM cartridge. Deep, rich QPQ/Melonite finish.

*.936 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 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: 17 Write a review »

  0 of 0 people found the following review helpful:
Great deal June 17, 2019
Reviewer: Lester Smith from Plant City, FL  
Shipping speed is crazy fast.  Ordered on a Friday had it in my hands on a Wednesday.  Works and cycles as it should with site recommended bcg, plus surprisingly accurate at 100 yards.  Should do good work on hogs.  Very pleased and will return for future business since website is easy to navigate for us old guys!

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  1 of 1 people found the following review helpful:
WOW! May 21, 2019
Reviewer: Jason Reynolds from Dodgeville, WI  
Bought one of these uppers with the recommended Tromix bcg and it runs like hot butter, no issues.  I was curious about the claims of how important the Tromix bolt was so it put in another brand 458 upper(not from AR15Parts) that I had given up on and it worked beautifully!!  I have no damn clue what the voodoo magic is on the is bolt but it speaks for itself.  Save yourself some headache on the advice of someone who has been through hell with a 458 and DO NOT BE STINGY!!!  Pay the few extra bucks for the Tromix bcg.

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  0 of 0 people found the following review helpful:
April 29, 2019
Reviewer: Robert Scott from San Francisco , CA United States  
Quality upper. Excellent customer service !

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  0 of 0 people found the following review helpful:
So far so good April 22, 2019
Reviewer: Brad Zimmer from New Winchester, IN  
So far so good.  Feeds great, shoots great and looks great.  Felling good about giving this outfit a chance.

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  0 of 0 people found the following review helpful:
Great all around April 20, 2019
Reviewer: Sergio Lira from San Antonio, TX United States  
It's not the best ever made but it's up there for 458s I'm only looking to update the BCG but beyond that a it's a great buy

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