I ran across your site while trying to research a piece acquired years ago in my collection. It is a 1896 Rifle, ser. #415xx with coarse exterior threads on the muzzle. It does not have the knurled cap.  I seem to remember that a few of these were altered for experiments using the Maxim Silencer. I'm trying to document as much of my collection prior to passing it off to my daughter. Thank you in advance for your help.