CHeck the barrel and receiver.
Remove stock from shotgun
Best to ask a gunsmith for help.
http://www.histandard.info/manuals/sears/pashotguns/index.html
The manual can be downloaded here: http://www.histandard.info/manuals/sears/index.html
Yes. The Mossberg 500A1 is a .12 gauge shotgun.
Yes, a 12 gauge shotgun is considered a firearm.
A bolt action shotgun in 12 gauge.
a 12 gauge shotgun can shoot about 30 yards accuracy
No, you can not shoot anything but 12 gauge shotgun shells through a 12 gauge shotgun. Never use any ammunition other than what the firearm was designed for.
Made from 1956-63. Unless you find one on the web, your best bet is to go to Remington.com and request a manual.
The 12 gage has a bigger barrel then a youth 20 gage shotgun.