Hello, I now am a proud owner of a G19. I have 2 15rd which came with it, in addition to 2 17rd I bought (G17 mags) and a 33rd happystick. I put the mag ext on a G17 mag, figuring this would allow me 19+1 and I'd be happy. However, the thought of an almost flush 15rd, holding an extra 2 for 17+1, is also tempting. What would you choose? And also, do I really need a new mag spring, as some recommend? These are all factory mags I'm referring to, and the pearce +2 9mm ext.