This is a life size, functioning LEGO Magnum, being sold on Bricklink. It has a functional cocking mechanism, an removable mag, and a moving trigger.
http://www.bricklink.com/store.asp?p=DoctorFaust
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Edited by kaibittner: 3/18/2013 8:22:52 PMHere are some more pictures, bigger too. http://www.mocpages.com/moc.php/356391 The hammer pull back further, but it's hard to hold and take pictures at the same time.