i just got done from teaching a 2 day advanced tactical handgun class! in 15 degree weather in in west branch michigan! every glock in class had trouble releaseing its magazines! in the cold! or ejecting them! had 12 total in class! the hk and sigs and smiths didnt! what gives the only thing i could figure was due to the cold and heating up of the guns caused the magazines to swell or the frame to shrink! as once we were indoors the trobles seemed to go away! on some of the guns! this made life hard for the glock guys on support hand only drill! king any help! there! ideas!