Big Bore Billet Upper Receiver

$179.00 $169.00

Engraved Ejection Port Cover

These covers are laser etched on both sides of the cover, displaying the caliber of the upper.

Feed Ramp

In order to select this option, you must also purchase a barrel at the same time since the barrel and receiver are “blended” together after assembly.


This receiver is machined from a solid block of 7075 billet aluminum and is much more rigid than a standard mil-spec receiver.

Ejection port opening is .665″ wide for use with 458 SOCOM, 375 SOCOM, 450 Bushmaster, 12.7×42 etc, but can also be used for smaller calibers such as 5.56.

The bolt carrier thru-hole is machined in one pass from one end, unlike cheaper receivers that have been bored from each end, resulting in a seam/step in the middle.

This is a very nice upgrade for your heavy hitting, heavy recoiling big bore upper.

Shipped complete with standard mil-spec ejection port cover and forward assist assembly installed.

Optional caliber specific ejection port covers are also available for this receiver.

Right hand ejection only.

Weight: .74 pounds