Shield Arms Standard Z9 Magazine Catch Glock 43 9 mm Luger Steel Ambidextrous Black Nitride. Our steel mag catch is optimized to work with the Shield Arms Z9 magazine. While it remains compatible with plastic OEM magazines it can cause increased wear on plastic mags with prolonged use. We recommend steel on steel or plastic on plastic. Specifications for Shield Arms Standard Z9 Glock 43 9 mm Luger Magazine Catch: Manufacturer: Shield Arms Finish: Anodized Fabric/Material: Aluminum Condition: New Features of Shield Arms Standard Z9 Glock 43 9 mm Luger Magazine Catch Steel mag catch several finish options; Ambidextrous; Chamfered textured button; Optimized for use Shield Arms Z9 magazines; Lower profile for concealed carry; Package Contents: Shield Arms Standard Z9 Glock 43 9 mm Luger Magazine Catch Shield Arms G43EMRBLK: Standard Z9 Magazine Catch Glock 43 9 mm Luger Steel Ambidextrous Black Nitride