December 27th, 2016, 11:16 AM
Join Date: Dec 2004
Location: Western MI.
To your first question, you may fire your Loaded M1A in all of the CMP Board matches. These include Pres. 100, NTI, NTIT, etc. The only match at Perry or any CMP match that your rifle would not qualify for is Modern Military.
As KurtC states, a bedded stock will make your rifle more competitive and if you decide to go that route, just buy a McMillan and be done with it, though they aren't cheap and there is still a considerable lead time on them.