Aftermarket but what a sale
They also have drums on sale for 39.99
Glock Compatible 9mm 33rd Magazine. Steel Lined and Reinforced Polymer Body Aftermarket Mag
This is a high capacity magazine for all Glock 9mm Pistols using double-stack magazines. This Mag extends out of the mag well. We cannot guarantee that all of these magazines will have a textured surface. Mfg Warranty - Polymer mag body lined with a steel sheath and steel reinforced feed lips...
www.classicfirearms.com
They also have drums on sale for 39.99