The pin does not enter the hole because there is very slight burr on the end but it then leaves a space between the end of the pin and the receiver. I suppose the washer is to take up the slack. I almost lost the washer when I dissembled the gun for the 1st time as I was not looking for anything like that. When I started to clean up I saw and had to look to see where the washer was suppose to go.
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