military-style semi-automatic rifles, black matte finish, synthetic stocks, detachable magazine, pistol grip, Picatinny rail, muzzle brake, telescopic sight, vertical foregrip, tactical appearance, high-capacity, long barrel, 5.56mm or .223 caliber, AR-15 model, selective fire options, combat weapon, law enforcement, self-defense, shooting range, controlled burst, gun safety, secure handling, firearms regulation, public debate, Second Amendment rights, national security, civilian use, gun culture, United States.