I was talking to someone about my new XD that I purchased and how I'll be carrying it.

Then they heard I had a p22 and asked why i didnt just carry that.

So I replied that I felt more comfortable with the 9mm

His retort threw me off and I really couldnt counter it, I was hoping you could assist me in either seeing the light, or having something to say.

His answer was that the AR-15 fires a .223(5.56) which is only a hair or two bigger than a .22 and because usually you're only needing a pistol in a small space (your house, a store etc) you dont need the extra velocity and the .22 would be as effective at close range as a .223 at a bit of distance.

I didnt want to argue for the sake of arguing so I told him id look into it.

Thoughts?