I have a Glock 19 That I have had for about 8 years. It came with 10 round magazines. I see that there are higher capacity magazines out there now - Even new Glock 19's are sold with 15 round magazines now. My question is: What's the largest capacity magazine I can put in the Glock 19 that does not stick out of the bottom of the gun? I realize that it will take very high capacity magazines, but I want one that looks exactly the same as my current 10 round magazines when in the gun.