Or maybe the Mass State Police?
They call it a "Patrol Rifle"
"We have found most officers have difficulty hitting the MPTC Q target with regularity using their service pistol at distances further than the 10 yard line. Now, factor in the stress level of a life and death encounter with rapidly evolving circumstances – the actual hit ratio drops even further. Beyond 15 yards the shotgun with multiple round projectile, may yield more hit potential however the recoil and manual operation of the shotgun has historically proved to be an issue with some Officers. If the load is buck shot, beyond 18 yards the shot spread will begin to exceed the width of the torso. This violates the accountability for all rounds down range rule. The slug round provides the logical alternative with longer range, more accuracy and no shot spread. It also has greater penetration which can be considered both a positive and negative factor when considering its use in urban areas or near thin walled homes. Conversely, the most popular patrol rifle round, the 5.56mm NATO (.223 Remington) will penetrate fewer walls than service pistol rounds or 12 gauge slugs.
The rifle is a superior tool. It allows the officer to either stand off from the threat or, if the situation requires, advance to the threat with the confidence that the tool in their hands can deal with almost any perceived threat. It has the power to deliver lethal terminal ballistics to the threat. It has a larger magazine capacity than our service pistol or shotgun. The longer sight radius makes it potentially a more accurate weapon which lowers the liability to the department."
Why wouldn't this also apply to non LEOs?