Builders Special .458 SOCOM w/BOLT – Right Handed


Blacken Stainless Barrel

You must select a “STAINLESS” barrel in order to choose this option.


Gas Block

SKU: BS-UPR-RH Category:


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

Includes 6061 upper receiver (optional 7075 billet available), barrel, gas block, gas tube, and complete head-spaced bolt head.

Does not include hand guard, bolt carrier assy, charging handle, or muzzle device.

Barrel is installed and feed ramp is extended, blended and polished.  Barrel muzzle is threaded 5/8-24.

Barrel Length: 16″, 14″, 12″, and 8″ – 1:14 twist only.   10.5″ available in both 1:14 and 1:10 fast twist.

For best accuracy shooting heavy subsonic suppressed bullets, we recommend the 12″ 1:14 twist barrel.

The 14-16 barrel, is a 14″ barrel with the skinny 4-port brake pinned and welded to make the barrel assembly 16″ overall.  A .875″ gas block will pass over the brake for assembly.

Barrel nut shown is for assembly purposes only.  It is a throw-away item and does not fit any hand guard.  Nut may be blemished.

Allow 5-10 days to ship.


Additional information

Barrel Finish

Black, Stainless