The .224 Valkyrie stretches the AR-15’s reach, sending lightweight, high-BC bullets past 1,000 yards from a standard-size lower. With mild recoil, it’s a great pick for long-range target work and varmint hunting. Building one takes a few caliber-specific parts, including a barrel, a 6.8 SPC-pattern bolt, and compatible magazines. Find them here, plus optics and muzzle devices to finish the job, or see more AR-15 barrels and AR-15 scopes.