Custom Built gun from the movie DOOM. This gun is not for the faint of heart. Internally it is a DBOYS SPR, cut down to fit into the shell. The extra weight comes from the Thick ABS shell around the internal SPR AEG.
Gun is for Coolness factor only and not really a field weapon. Maybe with a hefty M249 sling you might want to wield it for awhile, but not convenient for field use.