Big Bore Upper Receiver – Blank, no engraving.

$130.00

Blend Feed Ramp

Description

AR-15 upper receiver with ejection port opened up to allow the large caliber cartridges to eject.  Works with 375 SOCOM, .458 SOCOM, 450 Bushmaster, 12.7×42, as well as other large diameter cartridges.  Includes forward assist assembly and ejection port cover assembly.

These have no caliber designation engraved on the side.