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'
[Linked Image]FN 94 by Steve Zihn, on Flickr

Here it is with my calipers on it. As you can see the box is 3.305"
[Linked Image]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.
[Linked Image]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"
[Linked Image]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.