I was taking the bolt body off of my model 10 a couple weeks ago to put on to my Stevens 200 build just to get the gun together temporarily while I waited for my fluted bolt body from SSS. Any way after swapping parts I could not get the bolt back in to the Stevens. After scratching my head for a while it turns out that the cocking piece pin off of one (Stevens) was taller then the other. I switched it with the shorter one and no problems. So know I need another shorter one. When my fluted bolt body came in it needed the shorter one to work. I did not know that there was different versions of these. How do I know I'm ordering the right one? Or does anybody have an extra laying around?