Find a gunsmith and ask for help.
Follow owner's manual instructions.
Contact the maker if you don't have a manual.
Clean it.
The owner's manual provides instructions for disassembly to the extent necessary to properly clean the shotgun. Replacement owner's manuals are available on the Remington web site.
18 AND CLEAN RECORD
unless it wont shoot than no
Ask a gun shop or gunsmith for assistance.
Recommend you ask a gunsmith for help.
Take it apart, clean it, lubricate it and put it back together.
Ask a gunsmith for help.
ABOUT $50 TO $75 IF VERY CLEAN
Best to ask a gunsmith for help
http://www.histandard.info/manuals/sears/pashotguns/index.html
Please follow the cleaning instruction from the manual. The link is below