The soonest pen firearms initially showed up around the 1920s and have been conveyed by spies since the time that. The "Stinger" was the pen firearm model of the OSS, the forerunner to the CIA. In the same way as other eras of pen weapons, it was intended for short proximity utilize and shot a little .22 gauge round. It was single-shot weapon that couldn't be reloaded. Since the Stinger must be cocked with a trigger component, it likewise couldn't be terminated immediately, so OSS preparing manuals proposed that it be utilized from hid areas. The OSS's Stinger shouldn't be befuddled with the more advanced pen weapons that have embraced its name. These new models of Stingers were initially delivered in the 1990s, however they were reloadable and must be collapsed into semi-handgun shape to discharge. This ordered them as handguns by the ATF, which permitted them to be acquired without the pile of authoritative reports needed to claim a genuine pen firearm.