I've had three. First was a pre '68 burr hammer commercial that I sometimes used in IDPA competition. The only mods were the removal of the magazine safety and installation of low mount micro sights. Ended up selling it when I realized that the gunsmith had open up the slide mouth when he was installing the front sight which produced vertical play in the muzzle.

Second one was a post '68 spur hammer with adjustable factory sight I like it because I no longer get hammer bite. The mag safety has been removed, of course. Still have it.

Third one is ab FN wartime burr hammer in good but not new condition. Nazi proofed. Mag safety is removed and I have added a spare barrel in .30 Luger with a weaker spring to make it work. still have it.

They're great guns.