My Olympic Arms CAR-97 PCR ( Politically Correct Rifle )...bought during the AWB years, hence the missing bayonet lug. It was an " M4orgery " until I replaced the pinned "folding" stock with a six position folder from Oly...pictured with a red dot scope. It sports a true 5.56x45mm nato buttoned barrel...enabling me to shoot either 5.56 or .223 ammo...depending on availability.