lol... yeah that build a gun site is a h00t!
No good without a chainsaw bayonet.
Anything is tactical once you put a picatinny rail on it!
Congratulations, you have surprised me. I have seen every single one of those devices added to an M-4 or clone somewhere in the world (IRQ, AFG, BHG, etc) except for one.
I have never seen the extension down from the butt plate. I can guess what it is for, but I have never seen one used.