O.k. so I am looking into getting a Glock 21 to add to my 26 gen 3 and my gen 4 19. I am eligible for the blue label Glocks which as you all know gets me really great prices. So here is my dilemma. I don't quite have the cash to buy it yet but last time I was at the shop they had a "T&E" gen 3 and they had the gen 4's of course. They both had the same grip size as the gen3 was the SF. My question is this. Is the gen4 really any better than the gen 3? I ask because the gen 3 they had was like brand new and it was only $410.00 plus tax where as the new gen 4 was $464.00 plus tax. Any big benefits of gen 4 in this model?