The rifles that stand out to me are the ones that fix problems like weight distribution and gas tuning, instead of just adding new handguards. The Seekins SIC is one of the most modular precision platforms out there. You can swap the barrel, magazine well and bolt system to shoot anything from .308 to .338 Lapua without any tools. It is got a chassis receiver without action screws and you can take out the whole trigger control group without messing anything up..