I have Puma in .44 mag and added a Marbles tang peep sight to it. The sight came with two aperatures.

Sight picture is quite good, and the only improvement I might make is to put a post with a 3/32" ivory bead on it. One other nice thing about the tang peep is that it fits in well with the style of the rifle.

I did find that a minor modification had to be made to the setup. As is the rifle wouldn't cock all the way as the base of the sight is just a wee-bit high ( although it was listed by Marbles as being specifically for the Puma ). Either the grind front of the base down 1/8" or bob the hammer by the same amount.

"The whole problem with the world is that fools & fanatics are always so certain of themselves, and wiser people so full of doubt" Bertrand Russell