Hey Kiwi,
Good point although we experienced problems with some M1s donated to the Baltic States years ago using ammo previously designed for the R1.
Two issues - weapon chamber with head space in excess of 1.636 and a lacquer coating found on some of the SA surplus ammo.
As I recall the R1 was never designed to be a high volume repeater and would heat up after only 10 rounds - never understood why someone would bring an automatic to go deer hunting
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