The Shield Arms Z9 steel magazine catch for the Glock 43 is optimized for use with Shield Arms Z9 metal magazines. Using metal magazines with a polymer magazine catch could lead to reliability issues and excessive wear to the magazine catch over time. In order to keep your firearm functioning reliably it is recommended to run steel with steel. Shield Arms Z9 Magazine Catch for Glock 43 Specifications and Features Item Number G43-EMR-BLK Fits Glock 43 Steel Magazine Catch Optimized for Shield Arms Z9 Magazines Ambidextrous Chamfered Textured Button Low Profile for Concealed Carry PVD Coated Black Mfg: Shield Arms