An attachment for a firearm with a removable barrel screws onto the firearm in place of the barrel and enables firing a flare. The attachment includes a firing pin housing with a sliding firing pin extension, and a flare cartridge barrel, which may be temporarily removed to receive a flare cartridge...http://www.google.ca/patents/US6295751?utm_source=gb-gplus-sharePatent US6295751 - Flare attachment for a firearm with a removable barrel
