Do you know what model gun this is?
 

http://farm3.static.flickr.com/2671/...9b04b700_b.jpg

It is the one on the bottom. I think it might be a semi-auto shotgun from the diameter of the barrel, but don't really know. Then again, it looks too short to be a shotgun, to be honest. Thanks

Bottom gun is just a tricked out AR15 carbine with a fancy flash suppressor.

If you notice the magazine, you'll see it's a standard 5.56 PMAG.

It's a SBR or short-barreled rifle. It requires extra paperwork to have one.

Based on the setup: optics, mount, etc. the guy is pretty squared away.

Except for the Ergo pistol grip. Those things are just too damn scrawny.

...

The middle gun is a 12g Winchester 1300 Defender pump shotgun.

The top gun is a 12g Winchester SuperX2 semi-auto shotgun.