This is my Destroyer Gun (I love this word, "destroyer", I don't have much cases to use it). Its used to "destroy" the enemy without entering the house or room.
About this creation
She is the 2nd weapon that I build from the 1st one: I made a carbine, than I transformed it into a AR, than I made the XM07. The X is the military designation to prototype; the M, uhh, "military"?; 07 is from the year, 2007.
When my grandpa saw her, he told me that she looks like a destroyer gun, for "cleaning" rooms from enemies, breaking through the wall and killing who's inside.