I have a Glock 26/27, 21, and 34. I also have a Five SeveN, 1911, and DE50AE. I avoided 10mm because the ammo is costly. However, now that I have a DE50AE, I bought a Dillon 550 and am going to start reloading. So now I am considering a 10mm Glock. Keeping in mind what I already have, should I get the 10mm Glock 20, and if so, why? I carry my mini-Glock daily and use my Glock 21 for home defense (along with a 12ga). The others I use at the range.