Brad more than likely it is an A grade. If you remove the barrels the grade will be stamped on the action flats, also the serial# which will help determine the age of the gun. Could be that the homemade forend is causing the ejector problem, you can check this out by removing the wood and testing the ejectors. Original forends show up sometimes on e-bay, but you must know what to look for to determine the gun it fits. If it were me and the gun is as you say I would buy it

I learn something every day, and a lot of times it's that what I learned the day before was wrong