Good luck with the sale, quite a niche rifle that will undoubtedly shoot really well but will be considered a risk by many.
I have two Tubb T2k rifles that are of a similar ilk and use SR25 double stack magazines; awesomely accurate rifles but not standard so when something goes wrong where are you left. I have lots of spare parts, springs, plungers, detents and even a spare bolt. If another T2k came up for sale I’d not hesitate to grab it if funds allowed.