JL Billet has developed an AR-15 charging handle that turns the semi-auto AR-15 pattern rifles into a straight pull bolt action rifles. This accessory is called Kali-Key. It is primarily designed for the states with restrictive gun laws.
JL Billet Kali-Key Bolt Action AR-15 Charging Handle - The Firearm Blog
JL Billet Kali-Key Bolt Action AR-15 Charging Handle - The Firearm Blog