I've got two of the Mk IIIs; a matt and a bright blue.....................
1. The ambi-safety on the Mk III is a great improvement
2. Add a Millet ramp front sight to both..... the one that was standard with the Practical it has a large white stripe...... great for flash sight pictures with 60+ year old eyes.
3. Spegel Grips....... Hogues are good also
4. Got a few Mec-gar 15rd flush fit mags. just in case!

If I still carried cocked and locked it would be one of these............

I've had two FEGs in the past..... wish I'd kept them. IIRC KBI was in Harrisburg Pa. so they were not uncommon in LGSs in the area (live there for about 10 years) Nice guns, most local gunsmiths spoke well of them but they weren't "Browning HP" so somewhat looked down on by BHP owners at the range!