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That piece is used in front-powered Armalites and its purpose is to hold down the wire that travels from the mechanical trigger switch/circuit to the motor grip hole closest to the rear of the gearbox.
Run the wire to that rear hole, and place that piece in to the rear most channel/wireguide so that the "Y" is upside-down and pushing the wire down. It keeps the wire clear of the spinning pinion gear / motor head.
If you still can't figure it out, I can try to find a picture for you.
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