Mark III added a button magazine release instead of European-style heel magazine release. Also added a magazine disconnect safety and the LCI (loaded chamber indicator) and these last two items are so horrendous that in my opinion, they should both be stricken from the history of existence as items to add to a legendary rimfire target gun.

I will be more than happy to debate enthusiastically my position on these... besides mucking up a fantastic pistol, these two features actually promote poor gun handling practices. Yes, I said it, and I believe it to my core.