Mossberg 500A

[wilmsmeyer]

Got an older version that has a problem. When you pull the trigger it won't fire. Then you give it a sharp rap on the forearm and it will fire. The rest of the shells will also fire. It's only the first shot after it's loaded. Any ideas from you pros out there?

[sourdough44]

Sounds like a candidate to go to a reputable gunsmith for a deep cleaning and checkup. Something may be messed up in the receiver, trigger/safety mechanism.