Allow me to cite to noted firearms authority El Tejon, Director of Sushi Ranch, a well-known firearms training facility: "Never underestimate what force can do, especially to a wobbly AR mag."
Learn from this: 1) the vast majority of police, despite what VPC sez, are not trained in firearms and not really "into" guns to gain anything from the training, 2) there are 100 ways to screw a firearm up, 3) training trumps gear.