I have a Glock 23 with one problem: the mags won't drop free when they are empty. Now, a few things. I use 13 round full metal lined factory drop free mags. I have 5 of them which I purchased from at least 3 different sources, so I know it's not the actual mags. The mags drop free when fully or partially loaded (the weight from the ammo helps). It simply appears that the mag well is a little tight. I don't want to do the work myself, so my question is: should I send it to Glock? How is their customer service? How long will it take? Will they charge me? If so, how much?