How do figure that regulating accessories is successful when you can purchase all the parts necessary to assemble a standard (30 round) magazine and use a simple rubber band to  the same effect as a bump stock? I would deem the 15 round magazine limit wholly ineffective and the same would be true regarding any proposed laws on "bump stocks".  Now, both laws may make you "feel" safer, but is your false sense of enhanced security beneficial to you? I would argue that it isn't.