I had problems with the knockoffs and very happy with the Glock ones. Buyer beware.
I bought 4 of these magazines for my 9mm JR Carbine.Just shopping around for 32 round magazines in Oregon and wonder what everyone else is encountering. Went to the cabelas box store here and they had promag 32 rounders for $19.99 sold out completely! Irritating! They have a few of the Glock brand 32 rounders but they want $49.99 and Cheaperthandirt is selling them for $31.99 plus of course $4.50 shipping... There are numerous other manufacturers of these 32 and 33 round 9mm GLOCK magazines but I don't think it wise to get anything cheaper than the promag brand and possibly even they aren't suitable...
Looks like I'll be ordering some from Cheaperthandirt tomorrow
^^ Plus 1 on this .Guess I have to ask WHY? You can't carry the long things. The add a lot of weight to your pistol. They are not reliable as the spring tension goes from rock bottom to three rounds, and they are awkward. You are much better with a full original mag, one in the chamber, and another easy to handle spare mag. The only ones I ever see are idiots shooting in the desert like ammo is free. And you see the costs. But if you do need one, do not order Chinese or Korean parts from CTD, buy the original Glock mags.