This SIG P320 extension adds 6 rounds to your magazine. Easy assembly. Works on SIG P320 double stack Mags 9mm and 40. *Does not work with the M18.
Stock Spring is all you need.
Black hard anodized aluminium.
MADE IN THE USA
WARNING- The P320s have a chance of over insertion if you slam a mag in with the slide locked back. This can bend your ejector.