Be confident your Glock pistol will perform to factory standards each and every time with genuine Glock factory magazines. Manufactured to Glock specifications in Austria by Glock. All models include round count indicator on rear face of magazine body and standard factory baseplate. Mfg: Glock SPECS: Polyethylene body over steel liner. Glock factory compatible with Gen-4 guns. Gen 5 magazines are compatible with other Generations, but base plate may not match frame contour perfectly.