"...Ethiopia? I hope not!..." While I agree with you, it really just means it was 'rode hard and put away wet' often. We had a bunch of Sudanese AR-10's in the shop years ago that still had desert sand in 'em. Illiterate Third World troopies(usually untrained conscripts) didn't look after their kit. Mind you, most 2A's were issued to Indian prison guards, rural police and game wardens.
Keep in mind that 'fixing it' will likely cost a big pile of money. Parts, especially stocks, are not easy or cheap to find. There are no more 'stock sets' pretty much anywhere. And a stripped bolt head, that you need a handful of to fix headspace, runs $15.50US each at Gunparts. They claim it'll fit a 2A.
Having said that, before doing anything with the stock, slug the barrel and check or have the headspace checked. There is no point spending time and money of fixing the stock if the headspace is bad. Or the bore diameter is excessive. Mind you, 2A's tend not to have bore issues. Headspace can be bad though. Thousands of these rifles have been assembled out of parts bins with zero QC.