From what you say I'd shoot it until a problem arises. With all USGI parts the worst you'd have to do is change receivers. Odds are you'll be OK. If you're really concerned about something check the stickie for M14 gunsmiths and have it looked at.
As long as the bolt doesn't come out and smack you in the face you should be ok.
Just kidding. All the problems I have heard about Enterprise receivers had to do with out of spec receivers not being able to be mated up with parts. Since you have all GI parts, the rifle is already assembled and it functions fine I would imagine you are good to go until you shoot it enough to wear something out.
Some Entreprise Arms receivers came out fine and if you have one that works there probably won't be any problems. Unfortunately, many EA receivers were completely out of spec and not buildable. I have had success with several, but also sent a few back.
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