 Springfield Armory called the Hellion. The Hellion is a 5.56 bullpup. Now the bullpup takes the action in the magazine and moves it behind the trigger and the grip. Very short firearm. You're looking at 28 and a quarter inches overall length. Ambidextrous controls throughout as a 16 inch forged steel barrels one by seven twist and I had so much fun with it I took it to the range I set it in the optic I was able to fire this no problem it was so much fun it's a five-position spring-loaded stock the bull release is right here charger is over here just pull it this way an M lock hangar the BCM gunfighter mod 3 grip ambidextrous thumb safety flat face trigger