I am trying to determine if the barreled action I have was manfactured this way, or if Bubba has gotten to it.

I'll get a few more pictures later, but the one below is all I have at the moment.

I bought this 7mmRemMag barreled action quite a while ago, and am just not getting around to stocking it. It was in a group of 8-9 that all came with proof certificates still attached and apparently never stocked. All were proofed from 1972 to 1975. At the moment I cannot find the certificate for this one.

In the picture, it is the action on the left with the notched ring and shorter feed ramp. For comparison, the action on the left is another magnum Mark X in .300WinMag.

The magazine box has been extended with a section that has been spot welded to the front and the rest of the box is milled much thinner than the box on the .300 and other Mark X bottom metal I have seen.

Any help appreciated.