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A couple of years later, Sweden decides "Actually, we want these guns rebuilt for 9mm Luger and using ordinary magazines."
Thus, almost all m/37 subguns are converted to the m/37-39 pattern, in 9mm Luger, using conventional Kp-31 magazines.
There might be a few original ones in 9x20mmSR Browning that exist in some museums and private collections, and I'd be glad of that for what a weird artifact they are (one that's just really funny to me), but just getting them in 9mm Luger was what they really should have done from the beginning.
