At one time one of the companies did a short barreled version of the M1 carbine, but it was sold under the name enforcer. chopped stock and short barrel. Shooting the standard military load was loud and fireball caused the RO to come over and asked what we were shooting. Guy explained to the RO what it was and caliber. The RO shot it a few times and remarked at the muzzle blast and fireball. Even with ear muffs on it was very loud. Frank