Since you provided no information on the type of shotgun, or your location in the world, we have no idea, other than to check for local gunsmiths.
send it back to the Manufacturer?
I need the make & model of the shotgun first then I can send you a scan of the manual.
Send it to S&W
Send it off to the PSP office and they will repair it for you.
You can send it in to Microsoft and pay to get it repaired.
There are some sources for Crescent shotgun parts, but it is very possible that parts will have to be repaired/made.
You can send it to Nintendo and hopefully they will have it repaired. The problem is I don't know how much it costs sorry..
you can get your blender repaired at the place where y =ou purchased it, you can also send it back to teh manufacturere if it is under warranty period still.
Barrel
Get better internet.
Browning will send you a manual if you contact them.
Send it to the factory or a trained factory armorer