I was waiting to get to Vegas to get my single pos tube swapped with a spare 3 pos tube I have. it might not be for a few months but I will have one when I am able to get it swapped.
I did see some in stock but I do not have tools like some such as a drill press. Did you have to get longer screws or anything in addition to what's already included?
if you want to go the latter route, it is fairly easy, which involves the turning to remove the pistol grip stock. There are a few videos on YouTube to assist you. I also want to swap my fixed tube to make it collapsible. Stranger Danger can do it for a fee, which I might consider in the future.