although all plastic, very durable and dependable. have shot over 2k rds and still functioning perfectly., highly recommended

Magpie makes great products and this is no exception. There were some problems with the first production batch but Magpul acknowledged and rectified the problem replacing all of the recalled magazines. Complete polymer construction. Orange follow is a nice touch. I was a bit skeptical as I only used Glock factory mags previously. I bought one and I have used it exclusively on every range trip. So far about 1,000 rounds without a hiccup. Gen 4 G17. I now keep my glock factory mags for backup and carry use though I wouldn't hesitate to use this mag for carry use. My only qualm is the Magpul factory pricing. I can get an AR or AK PMAG for roughly $12. My thoughts are this should be priced cheaper since its for a handgun and uses less material. Still will probably add one to my next order.

i have two of these magazines and the feed perfect, fit the pistol perfect. good build quality. but, using them with gen 1 glocks may be a bit of a problem. on the last round fired, the magazine will drop an inch so you don't get the slide locked open.
i do have a gen 3 but have yet to test on newer pistols, i assume from all the other reviews that this isn't an issue with new pistols, i doubt many people are running gen 1 glocks every week. mine are the post-recall mags, hence why they feed well. if you have a newer glock, try them out.