Looking at the three sets of pistol racks of six and the number of long guns looks to match up to the number of pistols, I’m thinking that this is a security station that has three shifts of six. It reminds me of some Dept Of Energy set ups that I’ve seen but using private contractors. Probably two precision shooters covering a team of four (2×2) assaulters. The size looks like a conex box set up. But yes, as long as none of these fall under government restrictions they can all be legally owned by individuals who can pass a back ground check and they are legal in their states.