Many (most?) replica blackpowder revolvers were and are made in Italy, regardless of which label they are sold under. Take a very close look at the barrel, especially underneath the loading lever. If you find a "PN" stamp, that stands for Polvere Nera (black powder in Italianicon), in which case posting any marks you can find will help in identifying the manufacturer and make it easier to obtain any spares.

---------- Post added at 11:16 PM ---------- Previous post was at 11:08 PM ----------

Quote Originally Posted by toad View Post
What could be the problem ?

Old nipples often cause difficulty because they have been peened over, thus becoming slightly wider at the top, and the caps no longer sit firmly down on the end of the nipple as they should. If (as I suspect) the present nipples are peened over, then simply dressing the edge with a fine file can prolong their service life. Do not get into the habit of joyfully dry-firing the revolver without caps on the nipples, as some users do to test or demonstrate the action. The hammer will soon peen over new nipples if you do this.