My 1918 DWM has an identical chip as the gun broker gun. I shoot mine allot and the first time I noticed the chip was when the gun jammed open once. The axel pin rotated to exactly the right spot on the chip to let it slip out while the gun was cycling. Maybe the chip was there before or maybe it happened right then I don't know. The solution was very simple, however, I bought another pin from Tom Heller.
Marc
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