I know I'm biased slightly by seeing the 'in stock' email, but it's seriously difficult to go wrong with something like the BCM KMR Recce 16" Unit.
Otherwise, most any high end 16" SS barrel (match barrels are heavy enough that the smoothness of middy vs. intermediate is almost negligible, throw a can on it and the middy is still hilariously smooth), I'd definitely stick with the MUR-1A//KMR 13" rail as the rest of the template, because that is conclusively the most awesome way to go.
There IS an argument to look at MSTN for a build - the 16" Recce Custom Contour barrels (which are available in intermediate, which is still a minor plus) are basically a great combination with the tapered thinner contour, coupled with the KMR giving Mk12 type accuracy in a weight close to a generic 16" carbine. Again, the build would still be MUR/KMR.
I have two basically identical uppers (a Centurion 18" and HCS 16") - guess which one of those gets the most use. A simple 16" with good glass, good trigger, and mostly good ammunition is remarkably awesome, my SPR is basically hard for me to justify bringing out.
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"Being able to do the basics, on demand, takes practice. " - Sinister
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