I had the Performance Center work on my gun (1911PD Commander) after it had warranty (cosmetic) work done. I had them do the reliability package, polish & throat the barrel and adjust the trigger to 4-5 crisp lbs. It is a duty gun. The gun was reliable out of the box, but is even better now. I did have to send it back a second time when the plunger tube fell off, but it has been flawless since its return.