Could be either from the upside down pic. Probably a C2 though. Now I am not sure at all as I am comparing my C2 and it looks different. Might well be the crankaroo unless they made a couple of versions of the C2.
Excalibur’s CRANKAROO is the perfect solution for hunters who have difficulty drawing high poundage crossbows. The Crankaroo dramatically reduces the effort required to draw any of Excalibur’s models, as well as guaranteeing consistent string alignment. Unlike cumbersome permanently mounted...
My C2 has ridges on the inside of that “cutout” where the stock fits. Also, the crankeroo stud is closer to the top of the stock by 1/8”. I had to modify a stock made for the crankeroo to use a C2. Can’t give you measurements because I gave that bow to a friend.
That one went to Alberta, should be there by Sep 17, and then we will know for sure. I bought it and it didn't fit whatever excal I bought it for at the time. I probably needed a C2 and found a crankaroo. Just glad it got to someone who needed it. It was one of those things that seemed to good to throw away so it was in my equipment bins and boards for quite awhile.