I couldn't agree more with both of you. I always liked the 5.56 not only inside, but to get there. Of course we have smaller targets.
I would not want to take that 300 meter aisle shot with an MP5. A lot of people might be surprised at just how long some shots can be in an urban AO.
Somebody was talking about it not long ago in a newsletter or magazine or something.
Want an eye opener? Check your own environment for distance and cover. You will be surprised at just how little cover there is in your home and how far you might have to shoot.
Excellent discussion.