50-100 or so
no but it will fit a mossburg 500
not sure check sears
$50 more or less.
100 USD
No
You have stated what you have, not asked a question.
Your gun probably needs a good cleaning and oiling...either that or it's a Mossburg in which case you should just throw it away because you have a better chance of bagging something with a Mossburg by throwing the gun at the critter than shooting it.
I too have this gun, and I believe its a mossburg. That what I was told when it was given to me, and about five years ago I did replace some of the internal parts with that of the mossburg and they fit, and the gun works great again.
http://travel.webshots.com
Follow the instructions from the manufacturer.
Try e-gunparts.com