I have a 2 and 3 on Auction starting bid at 0 and after 4 days no bids on them, I don't know if the 4 is worth more. Best bet put it on a 7 day auction with no BO and see what it makes
Due to the fact that there is nothing in space that justifies more than 3 gunners on a privateer or mothership at the moment, probably worth holding on to it until MA updates space again in a few years.