937,500 at the end of 2015, vs. 826,000 a year earlier (figures rounded. All at the Texas DPS website. It might be a million now, but I will be that in light of recent events it will be well over a million by 12/31/16.
BTW, while there is no license necessary to open carry a rifle or shot gun in Texas, there is NO such authorization in the law within the limits of a city, and in most suburbs doing so will get you a very quick conversation with the local PD.
Texas law does not restrict the carrying of rifles or shotguns long guns except for:
Penal code 46.03.
But pre-schoolers are more familiar with the law than cops are, and carrying a rifle or shotgun anywhere will result in harassment regardless of what the law says.