BUT...
In the left images please note the small dent at the joint of the barrel and receiver. Tiny detail but there on the older Mauser and not on the SW version... (it shows in other images but I didn't include here)
AND...
Note the rail grooves. In the ANH HERO and the Luke Stunt, the grooves are almost non existent, very very shallow and washed out,
but on the Naked Runner version, the rail grooves are deep like on the other side !
I first thought that "maybe they filed the rail down", removing much of the groove but the HERO TOP view seems to show the same thickness of rail on both sides...and the rail would be substantially weakened if they did that. You would need to remove a lot of material...and why would they?
I think those left side shallow grooves are unique to the ANH HERO.
This has made me think that MAYBE, there could have been 2 bull barreled Mausers. Maybe one was a back-up.
Let me know what you think.
http://img19.imageshack.us/img19/2061/83li.jpg
Also, look at the length of the upper receiver between the barrel and chamber. seems longer on the NR than the HERO and the side edge of the NR vs the HERO.
The NR seems to be cut a bit longer than the HERO
Could be wrong, just some discrepancies. Could all be illusions and the lump weld due to damage on the one receiver and they filed off a bunch of the left rail for some reason...