http://www.patreon.com/ForgottenWeapons Cool Forgotten Weapons merch! http://shop.bbtv.com/collections/forgotten-weapons How Does it Work: Open Bolt vs Closed Bolt Firearms Most semiauto firearms fire from a closed bolt and most fully automatic firearms fire from an open bolt, but these are far from strict rules, and many exception exist. Open bolt offers better cooling and prevents any possibility of cookoff, while closed bolt offers better practical accuracy. Contact: Forgotten Weapons PO Box 87647 Tucson, AZ 85754