2/3/2020: Anchor Firing Gun:
Modeled in Fusion 360 after I found some really good refs, I've attached them below. According to the guide books the connector bit is supposed to turn so I put it in there separately in case anyone is really motivated.
I don't really know how to render in Fusion 360 but I put one up so you can see some of the extra details on the model.
Scaled to 80 mm wide + connector per the book, however I printed mine at 160 mm because they looked way too small (200%).
The author hasn't provided the model origin yet.