• Slick side .458 Socom stripped upper without forward assist, dust cover, and shell deflector - great for minimalist AR-15 build
  • Ejection Port sized for compatibility with 458 SOCOM rifle builds with no additional machining required on ejection port while retaining compatibility with all common AR15 caliber builds
  • 5 Axis machining center allows the highest possible accuracy during machining process
  • 65% stronger than standard 6061 aluminum upper receivers
  • "T" numbers engraved
  • Increased wall thickness for added rigidity
  • Compatible with most battery assist devices
  • M4 style feed ramps
  • Compatible with Mil-Spec AR-15 parts
  • Compatible with most aftermarket handguards


  • Material: 7075-T6 Aluminum
  • Finish: Type III Class 2 Hard Coat Anodized
  • Weight: 7.8 oz.


  • AR-15 lower receiver


You’ve looked at your options for a .458 SOCOM upper receiver and they’re somewhat limited. There are a ton of slick upper receivers on the market that you could buy if you’re interested in modifying an AR upper for a .458 SOCOM. Of course, that means you either need the skills and equipment to make those modifications yourself or the extra cash laying around to pay someone else who does. Even if you think you’ve got a reputable armorer/machinist to make those modifications, your mileage may vary. CMT Tactical offers a better alternative. The CMT Tactical UPUR-3 Slick Side Upper Receiver comes in a .458 SOCOM compatible version.

Why Do I Want the UPUR-3 .458 Socom Stripped Upper Receiver?

The CMT Tactical UPUR-3 is a quality AR-15 slick upper receiver that’s compatible with most quality AR-15 lowers. It’s designed and manufactured to work flawlessly in almost any AR-15 build your heart desires, but it has a bonus feature. This model of CMT’s slickside upper features an ejection port that’s sized to be compatible with 458 SOCOM builds with no additional machining. You could buy another upper and put in the blood sweat and tears to do your own modification. You could pay shop rates to have someone else do the work, to varying results. OR. Yes, or, you could purchase an excellent quality .458 Socom stripped upper that’s already compatible, and is available at an awesome value. It’s a no-brainer.

Quality Materials, Precision Manufacturing

The CMT Tactical UPUR-3 is a high-quality slickside billet AR-15 upper. The CMT starts with the superior strength and rigidity of 7075 T6 aluminum billet and a superior design for a slick side upper. They modify the design to make these work as a .458 SOCOM upper receiver and do the machining on cutting edge 5-axis CNC machining centers to produce what is quite possibly the most accurate SOCOM compatible AR upper on the market. 5-Axis machining puts an end to the errors and inconsistencies caused when parts are loaded multiple times for different operations by allowing one machine to complete a part in a single session. CMT Tactical’s slickside upper is ahead of its time, so you can give yourself an edge.

Have a question?

Ask an Expert