cutting the fine threads for the gas lock and milling the gas cyl slots has to be done accurately. the tricky part is getting the op rod bent the right shape and making all the modifications to other parts and getting the clearances right so they will actually function.I think that cutting the splines for the gas cylinder might be the trickiest part of converting a M-1 barrel to carbine length.
any decent machinest can shorten the barrel.




















































