I passed up 4-5 Mark II magazines at the gun show last weekend. I purchased 2 Mark III magazines on Ebay and one turned out to be a Mark II (they turned up after the show). My stock 22/45 Mark III functions fine with Mark II as well as Mark III magazines. I was wondering what is the purpose of the extra notch on the Mark III magazine (The magazine catch is lower on the body of the magazine.)
Thanks
Neil S.

Thanks
Neil S.