Bought my 11701 at my local Sportsman's Warehouse last month. Now reading these comments, I feel lucky they had some in stock. I had an order in previously at Brownells, but they sat on it for a couple of weeks, then cancelled my order saying they couldn't fulfill. Didn't look anywhere else.
I recently bought that same model of M4. At first I thought I was going to get the standard fixed stock. When I saw it had the collapsable, I thought great that's a bonus! Then I discovered that it only has one position, fully extended, and it just baffles me why they would do that. Thanks for linking some information on this.