A finished block of wood on floor for butt stock to rest on what works for my short rifles (Rem 870, AR's, etc).
I had to go that route because custom sized covers rifles are stored in will not allow for the dowel.
For now I lean my AR outwards, next to the door jam. I want to make some kind of loop that I can put the flash suppressor into...then extend the stock, this will ultimately make me very happy (when I get a round to doing it)
EDIT: OK....now I can get a good nights sleep, knowing my AR won't fall over onto my other rifles