Glockers- I am new to this site and have a couple questions regarding the Gen 4 21. I am considering buying one and I already own a Gen 3 19 and a Gen 4 17. First, are there any issues w/ the Gen 4 21 similar to those of the Gen 4 9mms? Second, how does the Glock platform handle the heavier caliber of the .45 ACP? I have heard that after a prolonged shooting session w/ glocks, the heavier calibers will wear out the shooter's hand, arm, etc. Last, if you own one how well do you like it and would you make the same purchase again. Thanks for your responses and knowlege.