I have a model 12 lrp and bought a bolt lift kit for it off a guy on snipers hide for a model 10. The bolt assemble screw on my model 12 has a small cylinder shaped nub on the assembly screw. Does the model 10 have the nub on it. Reason I ask is this nub is what contacts the ballbearing. Does the model 10 have the nub?

thanks guys