The actual Army XM2010's will shoot .5moa with the ridiculously over-pressured A191 190SMK. Going around 3100fps these days at 8-10K DA.
I agree that rifle is under-developed and over-sold. It is capable but heavy, bulky and overly "styled" chassis, poorly designed AAC brake attached suppressor, shooting 1960's-technology belted, over-bore, under-performing cartridge. They were just a one-time purchase to convert old M24's to 300WM bc Big Army was 300-jelly and SOF needed a temporary stand-in until the PSR -> ASR was developed and delivered. That is was paid for by Army $'s and not SOF $'s didn't hurt either.
I don't know why any civilian with good money would buy one or build a mock-up but different folks... different strokes...