I chambered an unprimed round into the Navy Arms, but the last 3/4" of closing the lever seems tight and when the hammer drops the bolt does not appear to move and you cannot push it in with your finger. It is like seized and cannot engage and push the firing pin nor does it spring rearward when bringing to half cock. However, I primed a case, chambered it, pulled the trigger and it fired the primer. I checked the primer and it has a good indentation, so it apparently is engaging the firing pin. Strange as it does not function in the same manner as the Cimarron. Yes, basically they are the same having a two part firing pin, the bolt and the actual firing pin inside that part that has the extractor attached to it. Sorry, I don't know what to call it.
One thing I forgot to mention the Cimarron is .45 Colt and the Navy Arms is .44-40. I have shot the Cimarron on several occasions but have not yet shot the Navy Arms. Since the Navy Arms fires the primed cases I chambered I guess I don't have the problem I thought I had.