I think as a DMR, I've found the LCT As Val to be pretty comfy, and it can quickly be mechanically changed to the usual 1.14 J full-auto. Problem is it's ridiculously expensive for an out-of-the-box DMR
I think if I had to go with a site compliant DMR platform, it would be one of the Delta Armory Mk.11s that probably have the best price-performance ratio with the short 5.56 magazines that can easily be configured to a normal rifle