That's been modified... it looks like the end of the main body has possibly been shortened. There should be 2 pins in front of the tail piece holding both pieces and the nut together... I'm wondering if the body has been cut through the pin holes...
As far as the jaw inserts and end cap, there are usually some for sale on ebay... I have heard of people using automotive wheel bearing hub covers on some of the bullet vises, but I haven't tried it myself...
-Bear