.458 SOCOM Complete Assembled Upper – Right Hand



Upgrade Handguard (Optional)

Upgrade Muzzle Devise (Optional)

Blacken Stainless Barrel

Must order STAINLESS barrel above, for this upgrade.

458 SOCOM Ejection Port Cover



Gas Block

SKU: 458-CAU-RH Category:


As of February 2021 – Lead time to ship your complete custom upper, built with your selected options, is 5-10 days after the order is received.

Ready to fire on your lower receiver. Available in Black 4150 chromoly steel or 416 Stainless steel options.
Base model (no options selected) includes black 4150 chromoly barrel, black flash hider, black gas block, bolt/carrier, charging handle, with plastic GI hand guards.  All barrels are threaded 5/8-24 except for the 16″ unthreaded model.  Standard twist is 1:14.  Fast 1:10 twist also available in 8″ and 10.5″ stainless steel only.  Large subsonic bullets stabilize fine with 1:14 twist in 12″ and longer barrels.

Upgrade your upper with the Midwest Industries CRM M-Lok hand guard or a round aluminum free float tube. Also available with various muzzle attachments, BCM GunFighter ambi charging handle, engraved ejection port cover, etc.  Note: NiB bolts have black extractors and ejectors installed.

Black chromoly barrels and Blackened Stainless barrels are externally coated with 2400 Series Bake-On GunKote.

The 14-16 with pin/welded brake is ONLY available with the already installed 4-port light weight brake.  No other brake can be substituted.  DO NOT select an optional brake if you have selected the 14-16 barrel.

All Tromix uppers are test fired prior to shipping.