Rotory safety, Inland, late war?

[BrianQ]

The 1944 date printed in War Baby! is an error. The type IV safety was standardized in March 1945 followed by the type IV magazine catch in April 1945. For Inland carbines you're probably looking at anything assembled 30 - 45 days after the standardization date could possibly have been assembled with the latest part type. For Winchester you'll find both items at the start of their six million block for reasons I won't get into here.