I'd take it if it was given to me. I think it's a nice work of art, and someone with a lot of creativity put some time into it.
Buy would I buy it? No. I'd rather have all 4 rifles working, thankyou.
ETA: Although, if I had money to burn, I'd buy it (assuming the rifles were still functioning), and convert it to look like a real chair. Cardboard ubes over the barrel-legs, paint it, upholster it, cover the back somehow, put a nice cushion in the seat, etc.. make it look like a real, nondescript chair.
Then, when "they" come for our guns, they'll never suspect the chair actually housed 4 ar-15s.