"...the change happened in 1963 around serial # 855,000 [change in style of barrel]. So if the barrel has a serial number on it then it is the old style with the pitched threads. The newer style barrels of the the interchanging type have no S/N on them. The old style threads are actually pitched just like a thread on a bolt. The newer style threads are straight V groove threads."
The barrel I have was from an M37 newer than S/N 850,000. Too bad, it's a 98% barrel.
Sorry
You seem to know about this change, so let me ask you this. Those thread designs below 855,000 were serialized and those after 855,000 dropped the serial number? So, is that a quick way to tell those.... which will fit my gun S/N # 78x,xxx, and those which will not?
Again thanks for your input.
