I have owned several of the FM pistols from Argentina. These are great little shooters and I have customized two of them. The down side is if you buy a used one. It's really not a downside persay. Just check the locking lugs in the top of the slide. If they have been shot up with HOT loads, they tend to round off and lose accuracy. I have only seen this on two and it happened about the time there was a bunch of cheap subgun 9mm curculating from overseas. I think their steel may be a bit softer but with factory standard velocity loads you will never notice it. I also noticed recently, that C&S will do custom work on FMs and the FEG pistols.
Best