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Call Mossberg directly. Tell them the issues you are having getting parts for this gun. If they have the part they will send it to you. I asked for a small spring using the part number and sight model number for a Mossberg reciever sight. When the package came it had a brand new complete receiver sight in it with a letter telling me it was "no charge" and part of their customer service program. I have not hesitated to purchase other Mossberg products because of this attitude.