I have thought about that some. I have regular 17 rounders and also will have TTI +5/6 extensions too as well as the 33 rounders and one with a Taylor Freelance +10
I'm shooting my first match next Saturday and am looking for advice, pointers, tips, etc that are applicable. Thanks! Adam Davino sent me a video with some very helpful tips which was a good start.
Check their site again. They make an extension for the big Glock mags. I bought two last week. It comes with a long spring as well.
http://taylorfreelance.com/shopping/index.php?main_page=product_info&cPath=1&products_id=117
I have Dawson comp mags with the aluminum base plate and they work ok but the mag lips have spread and I have issues with some of them. I went ahead and ordered (6) of the new style Wilson ETM and they are flawless. That's my 2 cents