SIG SAUER CONVERSION KIT,CAL-X KIT, P320 MAXM, 9MM, HEAVY X GRIP, 4x 10RDS MAG, ROMEO 3MAXEasily upgrade your SIG SAUER P320 to the MAXM with this conversion kit. Reliably convert to 9MM, improve grip with the heavy X grip, and maximize accuracy with the included ROMEO 3MAX optic. Comes with four 10 round magazines. MAX MICHEL THIS IS NOT A PISTOL YOU NEED A SIG SAUER P320 PISTOL TO DO THE CONVERSION AND THE SERIAL NUMBER WILL REMAIN THE SAME.