Alvin and Esteamed Mr Wood,
Re: +P ammo for a carbine in 9MM; consider the obvious. It simply takes more Uumph, to use a technical term, for a carbine action to cycle. This is intuitively the reason the 471A was developed. A +P in 9MM would approximate the additional Uumph required for cycling the action should a carbine be chambered in 9MM Parabellum. Me thinks this is one of those blinding flashes of the bleedin' obvious.
And to amplify Albert's astute comments on parts, recall that the 1920 series of carbines are mostly an assemblage of new, old stock parts cobbled together for retail sale. My 1920 carbine has several components that were obviously intended for military application when ORIGINALLY manufactured. It, BTW, is chambered in 7.65.
Tom A
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