I carry a G17 with attached Streamlight TLR-1. I just installed and tested a +2 extended baseplate last weekend at the range. The three mags that they are installed on worked flawlessly. I now have 20 rounds in the gun before I have to worry about loading another mag. I love that feeling of having so many 124 grain +P JHP on my person at one time. I also carry two spare mags as well.