Hello, Always loved the Thompson and I'm finally going to take the leap and get a SA 1927A-1. Don't have funds now, (if ever) to get a full auto. Anyway here goes.... Been reading alot and a little confused, are West Hurley models better or worse than ones made after KHAR got into the game? Can a detachable stock be installed on a model with a non-removable stock? If so is it as simple as taking the non-removable stock off and just sliding the detachable stock on or does the lower need machined for that to happen? What original parts will fit? Extractors, stocks, Lyman sights, etc.??? Any help would be great, thanks and have a great day.