Thanks Greenwing, I can ring around all the dealers and see if they have anything, but I was thinking I would have more chance of finding one on BBS due to the age and colour of cylinder I am hoping to find.

Maybe somebody has a SAM they no longer want or one that needs a repair etc, as this could be the best source for me to find one.

I actually like the pistol enough to buy another for my son if one should crop up at the right price during this search for a spare cylinder.