IMO, i would go with a 16 ultra light, a free flot tube and your choice of BCG. a SS or chrome lined would be fine. i build a buddy 16 ultra light just for the fun using a barrel from Bravo company and when we benched it, it was MOA all the time. comparing it with my CTR or JP15, ehh, no comparison,one would see the accuracy of this custom guns on paper
but on a match wherein the farthest target was 250, hits on steel all the time.
so it can done and you will like the weight savings of this setup. heck you can use a 14.5 and suppressed it if you wish and still get the accuracy you need