Shield Arms Premium S15 Glock 43X/48 Steel Magazine Catch Left Hand Opaque Black. Because the catch is not ambidextrous we were able to eliminate hard angles on the bottom of the catch for smoother reloads with our steel S15 magazine. The catch face has been slightly extended vs. our Standard Mag Catch by .03" and there is slightly MORE magazine engagement with this premium catch. Features of Shield Arms PREMIUM S15 STEEL MAGAZINE CATCH - BLACK LH GLOCK 43X: Model selections are Left-Hand and Right-Hand specific Designed to eliminate any hard angles that might inhibit inserting the magazine Enhanced ergonomic setting with extended knurling (1/32") Slightly longer engagement with the magazine Comes standard in Black Nitride coating WARNING: DOES NOT FUNCTION WITH PLASTIC OEM MAGS Package Contents: Shield Arms PREMIUM S15 STEEL MAGAZINE CATCH - BLACK LH GLOCK 43X Shield Arms G43XPRMBNZLH: Premium S15 Glock 43X/48 Steel Magazine Catch Left Hand Opaque Black