TexasCHLforum.com

The question may be whether the change in rules by the landlord is "reasonable" or if it instead causes something akin to a material modification of the lease. Would the prohibition of firearms cause a lessee hardships because the aggrieved tenant would now have to pay for off-site storage and now feels a considerable lack of personal security in their residence?

That may get you out of the lease contract, but would not stop the landlord from trying to evict if you decide to continue on with the lease. There's also the consideration of how likely it is that your violation of the new rule would be detected and what the consequences of such detection would be (eviction, at least). Weigh that against the idea of disarming yourself. Just my simple thoughts...