Long story short guys. For a past build, I started with a Stevens 200 in .223 which I converted to .243. I still have the magazine and bolt face. I've got a buddy with a Sav 110E in .243 (it's a first gen short action, not a long action) which he wants to convert to .223. I thought "no problem, I've got the parts he needs!". Well, it looks like the Stevens bolt head won't fit into the 110E bolt because there is a small detent in the bolt body which prevents the bolt head to slide in far enough to install the pin.

What's the deal here? Obviously these parts aren't compatible, so what kind of bolt head does he need and where does he get it? Is there anything else he's going to run into?