The author of the FN Browning pistol book has a new FN Mauser book out - "FN Mausers Arming the World" that goes into detail about everything sounding FN's creation and presumably that rifle, which is apparently the first third or so of the book. Ton of other great info too from what I understand. I plan to order a copy here in the next few weeks. It may have the information you're looking for on these.
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