Well, I am going to buy another Glock soon. I am stuck between a Gen 4 Glock 17 or a Glock 21SF. I really want a Glock that has an ambi Mag release since unfortunately I am a southpaw. Both of these models fit my hands great and would make nice additions to the collection. Caliber is not an issue and I have lots of 9mm and 45acp laying around. What do you all think?