You could go for an Elcan C79 instead of the ACOG. Also, we don't use the full-blown RIS on our rifles; we use the Triad-Rail mount, though good luck trying to find one. That'd be ideal though.
Otherwise, not bad. You could also spring for an ambi-mag release, and the coat-hanger-sized charging handle too.
It's all fun and games until someone gets hurt...and then it becomes sport!