If you select the lot, press CTRL-U (to ungroup it) and send the body and plate with my name on it to the back, you'll see two piston type things (I've actually refined this and replaced these with just spinning circles, because these were broken by impacts). On the end of the piston, there's little bars, there's code on those bar that cause a block of a certain size and shape to appear when it collides with something, then a negative attraction magnet pushes them backwards into a killer (to save lag). It's mostly done with Thyme although the key controls is actualy just turning a hinge.
This thread helped: http://www.phunland.com/forum/viewtopic.php?id=5730
I see G36 at the back thar, magazine looks like it's from a .50 caliber sniper rifle (knowing people, I'd say a Barrett M-something). Front end... I have no idea, mate.