Something worth mentioning.... I called Masterpiece direct.
If you have or are going to purchase a new or used Ds9, anything with serial #599 or less is the 'old' version. Anything serial #600+ is the new version since Dave took over.
If you call MPA, they will give you a free upgrade to your older pistol. Upgrade includes a complete new ignition system, trigger/safety, barrel, etc. Keith said it was basically a new gun. The upgrade takes 2-3 weeks.