Oh boy.
MP5 for the selector is attached to one lever. No gun type was mentioned anyways, and I am leaning towards the lower receiver retaining pin for an Armalite............ but it's not 1/2" long. There isn't a gearbox that I know of that has a 1/2" x 1/16th inch black pin inside of it. Just toss it on your spare parts bin.
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