I don't know if I'd ask a cop. Two reasons:
Asked out of the blue, it is a strange question.
And a lot of cops, in my experince, are no more gun savvy than they are experts on the law. Some are one or the other, a few are both, but by and large, they do what they are told, and carry what they are issued.
Several of my LEO friends bring a lot of gun questions to me. One of them made a funny observation years ago. He noted that everyone asks cops about guns (that they always wear but use infrequently) but they never ask cops about cars (that they use eight hours a day). lol
That said, I do know officers that are extremely knowledgeable in the field.