We now offer a rifle build #126-2 with a Magpull stock and our light weight barrel. There is such a small difference between .920" & .870" in a barrel channel that it not a noticeable difference.
The entire barrel is made of one stainless steel barrel blank from breach to muzzle with a clear anodized aluminum tube fitted over the top. There is a small portion of the stainless steel barrel that is visible and this is unfinished stainless steel. Good shooting! KIDD