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. Compatible with Gen 4 Glocks. Mfg: Glock SPECS: Polyethylene body over steel liner. Glock factory compatible with Gen-4 guns.