Well Riley mentioned "Back in St. Louis" so maybe there she was able to carry a gun and it carried over to her current job, many states have different rules, and if it did carry over then I am sure she had to pass a test to be approved (reminder nick had to qualify). Lets remember in last weeks ep she was well not surprised but did ask about a gun.Yeah, that's a good question. I mean Greg still doesn't carry gun.First question I asked while watching, why does Riley get to carry a gun when she's only a Level 2?
As to Greg not carrying one, it could be preference. He could be qualified and just decided not to. Also it could be that with Warricks death he is holding off until he is sure what he wants to do, so much violence (him, warrick, etc) in such a little time frame he might just be waiting.