You might want to read the press release again, and again, and again until you get it.
They didn't ban gun sales, only certain types of ammo - and only in some stores. Here in Texas, nothing changed at all.
99% of people who have a license to carry - don't open carry (they carry concealed)
The people affected by the open carry ban need only un-tuck their t-shirt, and they can still enter the store with their firearm concealed.