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I just thought of something and confirmed it. Camp Mabry is owned by the state. Travis County Appraisal District says the land is owned by the state and land alone is valued at about 16,500,000.

Camp Mabry is the Headquarters base for the National Guard in Texas. I have always been told that it is a state owned facility but I could not find real evidence of that just now searching for it. The official history of it (on the state military forces museum page) shows that the post was started by Austin donating 80 acres of land to the state, then the state volunteer forces (forerunners of the National Guard) raising money to buy another 95 acres, and the federal money buying 200 more acres.

What makes me thing it is still state owned is the former use of it for DPS as a police academy site (TABC used it quite often also, but coordinated that through the Guard offices). It still also houses the headquarters for several state offices, including the Adjutant General and the State Guard. But there is a joint state/federal office there for property disposal and I know of a Navy reserve (not Guard) unit that is also based there (but their site is set off from the rest of the base with separate fencing - the only way to it is from Camp Mabry though).

So, I still think it is state owned and they could not legally make you unload the weapon that way. But I cannot prove that for you.