Last year I consolidated everything to 9mm. I currently rotate carry between a Glock 19 and a Glock 26. Depending on what I'm wearing. I decided I want a full size gun for the night stand. I'm torn between the Gen 4 17 and the Gen 4 21. Adding a caliber would give me another option when ammo is hard to find but I already have a bunch of magazines for the 17. I can't make this decision on my own so any input would be appreciated.