Ah yes! Forgot about that one!! I've never seen one in person so I can't compare them. Only thing I can compare to are the 4 pictured!
Looks like a nice rifle though!
45nut -> if you can take it apart and inspect the internals, you are looking for tool marks and factory grease. Remove all of the factory grease, lightly lube and you are good to go, if there are tool marks where the moving parts connect, you can use a nice set of sanding stones (very fine) to smooth things out, usually doesn't take a whole lot of work, you don't need to get all the marks out, but it does help to just smooth things up, you'll fine it helps the lever action be a lot smoother. Once you use it enough it will break in on it's own, but this is easier on the internals and gives you a much nicer action. The other option of course is to sit in front of the TV and work the action a few hundred times! That works too!
Either way I love the pistol grip and big loop combination! So make sure if you get the GSBL you get us some nice close up pics!
Cheers!
Mazer