Read some of how aftermarket magazines do not always function well, I enjoy shooting my 1903 but would rather keep the factory mag set aside & have a couple others to use instead. My gun functions flawless every time out & I want to keep her that way if possible. Does anyone have any Brand experience as I really can't afford to pony up for a couple of factory ones at this time. Found some by Triple K but know nothing of these or any others for that matter. Also would steel be preferred over plastic/polymer or?? Thanks for any help guy's, always a joy to read here on the Colt forum.