I have a 4.55m second production block Rock-ola. According to Ruth (War Baby), the type IV stamped trigger housing use began in the second block. I have a type II trigger housing in it, which is a first block housing that ended in Dec. '43. Mine would have been made between Jan. '44 to Apr. '44, but probably closer to Jan. Not sure. Is it possible that although type IV housing began sometime during this block, that some older type IIs were used also? To be accurate, the carbine came to me with an Inland housing, and I installed the type II Rock-ola.
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