I have 5-Glock 33rd mags . 2-with TF extensions and 3-stock. The 3-stock ones drop free empty or loaded. 1 of the extended one's won't drop free either way and the other extended one only drops free when empty. Don't really care on the extended one's as they hold 41 rds and shouldn't need to reload in USPSA unless there is a malfunction. In that case I will just yank it out. If I ever go to an outlaw match then I might look into a fix. Even then the 33 rounders should suffice, there is always a place to reload on a long course.