This is the double barreled shotgun that requires one pump to load two rounds unlike KelTec KSG. Once the two rounds are loaded, each trigger pull will fire one round. So one pump means two trigger pulls.
This was a popular item as you can see with all the empty shell casings on the ground
The makers of DP-12 also had a rifle and a bullpup rifle. Unfortunately I wasn't able to get information about it