It seems like I've been waiting for forever for the Gen 4 Glock 20 to come out. Does anyone have an idea or Info of when they'll start being produced? I'm not sure if i should wait it out or just buy a 6" 10mm barrel and a few mags to use in my GEN 4 GLOCK 21 FDE. Are the g20's just not that popular for them to get working on it sooner? I thought they'd be out months ago considering they use the same frame as the 21.