http://www.theblaze.com/stories/2013/03/27/the-awesome-adapter-for-your-12-gauge-shotgun-that-turns-your-gun-into-an-ultimate-survival-rifle/
In an extreme survival situation where the appropriate amount of ammunition for the type of firearm you’re carrying can’t necessarily be guaranteed, what would you do? Carry multiple types of firearms to increase your chances of coming across ammo you can use? You could do that, or you could have an adapter system that comes in a handy pouch that allows one 12-gauge shotgun to take 11 different types of ammunition
In an extreme survival situation where the appropriate amount of ammunition for the type of firearm you’re carrying can’t necessarily be guaranteed, what would you do? Carry multiple types of firearms to increase your chances of coming across ammo you can use? You could do that, or you could have an adapter system that comes in a handy pouch that allows one 12-gauge shotgun to take 11 different types of ammunition