Yesterday a guy took my unused spare mag from my Mark II and converted it so it works in my Mark I/Standard model. I went to the gunstore today to buy a replacement for my Mark II (the Mark I is my wife's and can now hold 10 rounds). They had Mark I 9-round mags in stock! This is after I first called to see if I could get a replacement mag for the Mk I pistol and they said no. They also had Mark III mags in stock. he said he can't get Mark II mags. Will a Mark III mag fit a Mark II? I've never had a Mark III so I don't know how they are made. Thanks.