I have an Evo 45 on the way ... .... eventually.... but after ordering it I began to think that utility might be a lot less than I had dreamed into it. It should be reasonably quiet, wet, but I really think the most useful suppressed weapons are .22lrs' If you get an integral MKII or a good compact muzzle can you can trade it back and forth on a bunch of guns and really have some fun with it.
It's like- am I going to be able to fire the .45 in my backyard? Pro bab ly no ot. So what the hell did I get it for again? I don't know. Cool accessory to round out a crazy custom 1911.- good way to burn $900.
I think the 9mm EVO makes more sense, or if you are a Beretta user you could get one of the AAC snap on 9mm cans with a stainless blast baffle and get adaptors put it on everything from subguns, and nine millimeter carbines to .22 rifles and pistols. I was told it will still do 38-40DB with .22lr ammo. or maybe thats in the manual somewhere. The mounts might be pretty steep though- maybe M60 Joe could do a slew of mounts [machine them right into barrels] at one time and save you some money.
A Ruger MKII with a 3 inch barrel and that mount, can and a dot sight could still possibly be a pretty handy gun. 2.75inch barrel and 40 grain CCI velocitors will give you 935 or 950FPS.