I think the receivers were also sold separately, but yes, they were used on the Springfield, Inc., Garands made in the 2002-2008 time frame.
I have one of the Springfield rifles, and it's a great shooter. I think all of the small parts on my gun (beyond the receiver, barrel, and stock) are U.S.G.I. I have not heard that the latter may not be in spec? That is, any old G.I. parts might be suspect, but I have never heard anyone report that their commercial Springfield Garand containe out-of-spec G.I. parts.
My gun is from the first year of production.
I have heard, as is the case with Springfield M1As, that as supplies of U.S.G.I. parts dwindled, commercial parts were substituted.