Thats a M3 T&E , it will not work on an M2 tripod for the 1919A4. I know I have been down this road before, also the M2 T&E lock will not screw onto that thread because it is different. The saddle area is larger on this one making it not clamp down onto the traverse bar of the tripod, will only work with a 50 cal tripod.
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