Man i have been looking all over what i finally did for my friends s&W is use the 1911 extended release the one that you have to drill and tap the original and screw the button on, it will work with the s&w or you could make your own buy using a precision saw to cut the button off a after market mag release for a 1911 drill a hole dremel it so the head of the crew fits in the end then drill and tap the old mag release screw and thread lock into place there you go