Receiver and trigger housing stock clearance differences?

[jimb16]

For what its worth, there were some minor changes in the stock milling for the recoil plate during the production of the carbines. Changes were made when different style recoil plates were developed. And then very late in production another change was made to better support the type 3 recoil plate. That change was the elimination of removal of wood directly below the recoil plate to help support it and keep the barrel from sagging into the barrel channel. Not sure when each of these changes were made or which stock makers implemented them, but I do know that changes were made.