Alvin -
The purpose of the "muzzle cap" is just to keep dust, dirt, and moisture out of the barrel when the rifle is being stored.
I suspect the other item you saw advertised was actually a "bore protector" if it was advertised as being used to guide the cleaning rod during cleaning. If you clean the bore from the muzzle end, the metal rod can wear the rifling near the muzzle. So someone came up with the idea of a device which would fasten to the end of the barrel, with a hole in the middle so that the cleaning rod would not actually touch the rifling at the muzzle. You already know that all these military Mausers had cleaning rods that were too short to extend the entire length of the bore. So frequently the idea was to screw the metal cleaning rods end to end so that they would be long enough to clean the entire length of the barrel.
There are lots of styles of muzzle caps, but I was not aware there was a bore protector for use when cleaning the Yogo Model 48. It looks like the one in your picture has this hole which will allow the cleaning rod to be used and protect the rifling at the muzzle.
Mauser720 - Ron
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