Just a little note guys i was doing this mod for a guy and being that the 9mm shells are longer then the buttons, I found using a tubing cutter you can buy at your local tool store or automotive store worked best for cutting these to length, I cut about ten of them to length in about 5 minutes or less. scribed like jr says with a pencil and cut them on the line with a tubing cutter worked great no sharp edge to grind off .
works great