Actually, the "Sheep Port" option is the cut on the left side of the loading/ejection port. It is a milled flat instead of the standard rounded contour on the left side.
Shown here......this one also has the Remington rear bridge contour
Another nice little custom touch not listed on their website is the hidden bolt release pin at the top of the bolt release lever. They use a machine screw ran up through the bottom to secure the bolt release lever so you don't see the exposed pin like in the top picture.