ACTION TUNE MODEL...This model will is action-tuned for those who want the best trigger pull possible in their defensive firearm. Wilson Combat engineers have changed the WCP365 slide's shape and texture to make it more tactile under stress with Wilson's exclusive X-Tac pattern cocking serrations, side top serrations and heavy slide bevels all around. They have also perfected the action of the WCP365 and in combination with a Grayguns trigger and their spring modifications we can make the excellent 365 trigger even better.