I don't recall seeing a M 11 with a magazine cutoff...
Is this a feature that some guns had others did not..??...
I've handled and shot several M11s and cannot remember one with the cutoff, unlike the A-5s, which were basically the same gun..
Perhaps it is just my moldy old memory, but I DID google up pictures of a couple of M11s which showed the port side, and they did not have the magazine cutoff.. Could it have been a factory option..??..