The Shield Arms steel mag catch is optimized to work with the Shield Arms S15 magazine. While it remains compatible with plastic OEM magazines, it can cause increased wear on plastic mags with prolonged use. We do not recommend using our steel mag catch with plastic OEM mags. Steel mag catch, several finish options Chamfered, textured button Optimized for use with Shield Arms S15 magazines Lower profile for concealed carry Made in the USA 100% lifetime warranty Mfg: Shield Arms