.458 SOCOM Complete Assembled Upper – Right Hand


Handguard *

Upgrade Muzzle Device (Must Select One) *

Blacken Stainless Barrel

Must order STAINLESS Barrel above, for this upgrade.

Ejection Port Cover *

Receiver *

Gas Block *

Charging Handle *

SKU: 458-CAU-RH Category:


As of June 2024, allow 5-10 days for this item to be built and shipped.

Ready to fire on your lower receiver. Available in Black 4150 chromoly steel or 416 Stainless steel options.
Base model includes a 6061 M4 style upper receiver, black 4150 chromoly barrel, black flash hider, black gas block, bolt/carrier, and charging handle.  You must select a hand guard option or have no hand guard installed in order to purchase this item.  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 10.5″ stainless steel only, recommended for shooting any subsonic suppressed ammunition.  Subsonic suppressed bullets stabilize fine with 1:14 twist in 12″ and longer barrels.

Upgrade your upper with the Midwest Industries CRM M-Lok hand guard. Also available with various muzzle attachments, engraved ejection port cover, heavy duty 7075 Tromix Billet receiver, Ambi charging handle, etc.

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.