That was at the same time as the big simplification of the manufacture of small-arms committee sat. They eliminated masses of superflkous crap at a stroke of a pen. But it wasn't THAT simple. Some sub contractors used certain features as datum points for the next stage of the manufacturing operation and so on so thay had to retain certain features until they could update their processes. So there was a good deal of overlap and goodwill until the changes were implimented. But this goodwill wouldn't have lasted for long as standardisation is what you need in all out war
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