"Patrol Carbine" is a marketing term. Just like the word 'tactical'.
"Assault rifle" is a misnomer coined by left wing media hacks to make battle rifles scarier. By definition, only 2 such things have ever existed. The AK-47 and the Stg 44.
IMO, "Patrol Carbine" is a friendly, cuddly term used to describe a firearm in the hands of agents of the state. The exact same firearm is a baby killing assault rifle when a citizen owns it.
It's very specific and insidious terminology.