I had my PT740 in for repairs because of a reloading accident that basically required replacement of the barrel. Sixteen weeks down the road with no realistic return date available from Taurus I inquired to the forum members regarding the interchangeability of these two guns barrels. One member responded saying that he had a PT111 and PT709 and that their barrels interchanged so I decided to buy a PT140 barrel and test their swappability. They won't as the PT140 barrel is belled and larger in diameter at the muzzle end and completely different at the chamber end where the barrel actuating machining is located. I'm going to return or sell the PT140 barrel.