I think #4 is a .50 caliber Browning Machine Gun firing pin mount... I used to own the firing pin that fits in the machined recess in the front of it- and I have used it for a pin punch for years for disassembly of M1911A1 Colts... half of the sear surface is on the other end...
corrected $5 to be #4 - JS
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regards, -John S
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