It's true that each store is left to carry what they wish (within the restrictions of the business firearms licence they have).
At my store, since we are literally about 10kms from SFRC we don't even bother carrying anything but hunting rifles and shotguns - no mil-surp, no black, no red - nada.
SFRC does a far better job, is better equipped and way more knowledgeable which allows them to service that market. Plus they carry powder, reloading supplies etc that we don't which is why I shop there.
So at least at my store, we assessed what "market" we wanted to serve and carry accordingly. No pressure from Corp or anyone else to carry or NOT carry any given product.