The first is a Stalker and were custom made on per batch orders (constantly changing) by Kent Carrol as the last Combat Connections guns. According to Kent:
"It was these “on-the-fly” modification requests that caused the tooling problems that caused the argument that resulted in my dismissal [from a contract with NPS]."
The second gun is (as far as I have been able to tell and from asking Craig Palmer), a pre runner to the BBT Tyhpoons.
When I showed this to Craig he told me something along the lines that BBT began making a batch of removable barrel pumps but could not get the pneumatics sorted out for their semi version. Because of this they contracted or partnered with PPS to offer the BBT Typhoons.