Originally posted by Wolfala 
OK, the 11 year old with the MG42 put me over the top. BUt how the hell did that 1 guy get a live M203 round? 
 That looks like one of those 37mm (not 40 mm, like a real 203) 'flare launching" kits they sell.  They also sell empty casings, flash/bang shells, flares, and reloading gear.  All perfectly legal, until you make a frag or HE grenade.
That one looks like a low-yeild flash/bang.  Probably legal.