My life size Lego Uzi Pro. It has a few different working features, including a working bolt system, removable magazine, iron sights, working rail system, and a moving safety.
Imagine this. You've just trudged through the snow to a barn, wearing no more than you're normal clothes with the exception of a thin sweater on in negative degree weather, holding a cold camera with no gloves, taking pictures of a Lego gun. You finally found the perfect spot to take pictures, and right when you bend down to set the gun down, you drop the weapon and it shatters on the ground. Now you're faced with the choice to walk back to the house, which is only about a minute away, or rebuild the gun for a period of time exceptionally than the alternative with freezing numb fingers. What the heck, why not the second choice? And I didn't even end up using any of those pictures...
Anyway, more about this gun; It only took two days to build, and it's a pretty simple MOC. It's a very square gun, so barely any sloped pieces needed to be used. I love the look of it, and with all the working features, it's quite the 'pew pewer'!
Hope you enjoy!