Have you checked out the Noveske 14.5" uppers that are in stock? For the money, you get a really nice setup that includes a cold hammer forged barrel (this is a better barrel than the Colt in terms of longevity).
I would leave it “as is.” I think every AR collection should have a bone-stock 6920.
Since you have a Noveske lower that is needing an upper I would just get another upper rather than go to cutting on a perfectly good barrel. A Noveske upper for your Noveske lower sounds like a real winner.
Thanks for the input, originally the noveske was a project build for my brother but he has no need for the rifle. So here it sits without an upper, I think I’ll just get an upper for it and sell it off. So I can use the money to benefit my Colt…