Some bayonet scabbard-tips have a pointy end, and some have a flat end. For an example of the latter, see the photo below, which shows an 1803-1837 British Baker bayonet scabbard-tip's flat bottomed end.
Also... some scabbard tips were solid-cast, and some were a rolled-sheetbrass sleeve with a finial soldered into the smaller end of the sleeve. Often the finial is missing from excavated specimens, leaving an open hole at that end of the sleeve.
A way to tell whether a similar-looking brass sleeve is a scabbard tip or not:
If it is a scabbard tip, there should be a small punch-hole (sometimes, two) near its wider end, for the tiny pins which attached the scabbard-tip onto the scabbard's main body. See the other photos.