Sure it is. If a state decides they don't want people carrying firearms in courthouses or jails or schools or sporting events then they have the power to prohibit it under the 10th Amendment. If they want to ban felons from owning firearms then they have the power to do so under the 10th Amendment. If they want to become Constitutional carry or if they want to require training to get a concealed carry permit then they have the power to do so under the 10th Amendment. The Heller decision said that states cannot prohibit a citizen from keeping a firearm in their own home. But the same decision said that reasonable restrictions are within the state's power to enact. Under the 10th Amendment.
Its going to depend on interpretations of reasonable. I do think an argument can be made for the bear part of keep and bear arms. Some states are so restrictive they make it illegal to even have in the car for anything other than going to the range or the gunsmith.
I am more concerned with patently unreasonable conditions like California sets which require any new handgun to be able to stamp the bullet with ID even though the technology doesnt exist. Furthermore if the design of an older model is changed at all then they claim it is a new design and add it to the ban list.
The USSCs reasoning in Miller was that a sawed off shotgun could be banned because it was not reasonably related to the need for a militia. ie it was a nonmilitary-type weapon. OK. Fair enough. By that rationale, every single restriction on or ban on semiautomatic rifles or high capacity magazines should be struck down as unconstitutional.
Sorry, BOR, instead of BOA. Spellcheck is a sinister beast at times.