It seems you don't quite understand how it'll work. The faction weapons and such will be immediately available upon purchase for legendary marks, given that you are the required rank. The Gunsmith on the other hand, upon being the required rank, will have Foundry weapon packages that can be [i][u]special ordered[/u][/i] for a certain amount of glimmer. The following week on Wednesday, they'll be available for pickup. Essentially, it's like ordering something online, then having it delivered to your home, or a store for pickup, at a given date.