I too have an interim and it looks identical to yours. Mine is a TBV2XXX. I mean exactly the same. Screw on the right side of the safety, the wrap around grip, etc. I too would like to know the history of this one. I just picked it up from a local nearby probably had all of 50 round thru her. Would I need to order a back strap in order to change grips? It looks as though the rubber follows right up the back of the grip.