Hey Z1R
Sorry to take so long. My apologies.
The photobucket screw job made me use Flickr, and I had to get my camera back, so I was not ignoring you.
I think your request is very reasonable.
So here are the pictures
Here is a FN M94 Mauser (badly pitted, but that doesn't matter for the purpose of this illustration'
FN 94 by
Steve Zihn, on Flickr
Here it is with my calipers on it. As you can see the box is 3.305"
FN 94 Measured by
Steve Zihn, on Flickr
Here is a Carl Gustav M96. You can see part of the stamping to the side of the scope base.
C.G. 96 by
Steve Zihn, on Flickr
Here is the same action with my calipers on the box. As you can see it's 3.440"
C.G. 96 Measured by
Steve Zihn, on Flickr
That's 135 thousandths different. Over 1/8"
Not a lot, but they are NOT the same. The parts do not interchange.