It looks like a modern style of a Roth-Steyr M1907

Its bolt and barrel both move.

caliber?...

9mm, and operation is based on roth steyr but has detachable mags.

okay, based on roth steyr, 9mm, detachable magazines, bolt and barrel move, from the country swordfish's book takes place in....

South african 9mm handgun. based on roth steyr. come on, guess.

It's a Musgrave.

yep, your turn

this one should be quite easy. I photoshopped the grip to remove the manufacturer's brand logo:

http://i2.photobucket.com/albums/y45...ms/obscure.jpg

Anyone? Do you need hints?