Big Bore Billet Upper Receiver


In Stock

Engraved Ejection Port Cover

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

Receiver Modification – You must buy a barrel if you select this option.


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: 11.8oz