You must be coming down with a strong dose of nostalgia! Something to compare to the Feinwerkbau Sport? The trigger on the Merc 'S' is better and so is the handling. If you get a Maccari spring you can sleeve the piston and get rid of the 'twang!'....
You must tell us how it shoots, with 30 yard groups sizes and everything. I can tell you are not going to hang it on the wall.