I claim no knowlege re French arms but I have an interest and some references. At the J. Davis Guns Museum Claremore Oklahoma is a case with a Berthier Carbine that has an odd receiver with a pivoting safety lever located behind the bolt. The receiver is built up in that area to accept the lever. The other side of the receiver and its markings was not visible. Can someone expand on this, I assume I should buy one if I see one.