At one time back in the day, inside most police cars were equipped with an M-870 shotgun. Then there's an odd ball patrolman with his AR with .223 caliber. Which patrolman has the advantage? The logic behind the usage of an AR stems from situations where a firearm needed for greater range than a shotgun. Or how about shotgun folks talk about having knock down power to stop the fight with its 00 buck. AR's high velocity & capacity with 30 round mag makes up for lack of Knock Down Power. Which is better? There needs to be a...