Mick, I agree but I now have 3 Mausers with the back trigger removed, the units are fairly pricey - around $200 for the unit alone not to mention installation. Better to save the unit and install a military trigger which are dime a dozen. This is the road I have taken till I either find / make replacements. FYI, the set triggers on a 21 Brno are mounted right in the bottom metal assembly so to install a single trigger, of some sort, one would have mill away the trigger assembly / get other bottom metal. About a month ago I got interested in an 8mm Brno until I picked it up, some one not only drilled holes but got the file out, I don't know why but it looked like some one tried to install Sako tapered rings, done properly (milled) it would have looked OK (and could be an option and look pretty slick) but with a file - makes one wonder. --- John303.