had a look at the link you sent the western ones look like denix i had a couple for a while ones up on my dads wall now as a display i made him (he did a lot of western shooting before they banned pistols here)
5mm caps fit in the back of the solid dummy rounds side flash is ok but obviously no barrel flash or much smoke the toy cap gun caps fit in aswell so works out a cheap option,
i did get to use mined once for a theatre production did the trick and wernt too loud to use on stage