Perazzi monte carlo stock set for round receiver like an MX3. It will also work on standard MX8 but corners of the stock are round so square receiver will stick out past wood a bit. Serial #117XXX Dimensions off MX3 rib: 1.29 x 1.29 x 1.93 No palm swell Neutral cast Length of pull 14.625 Has a recoil pad adjuster $699