Sig APP is their Armed Professional Program. If you qualify you have to go to a special dealer and can get certain items for a discount, but even more so at the mercy of Sig as they will not even estimate times for delivery.
I dealt with a huge issue as well. I ordered a 9" 5.56 SBR almost 2 years ago, and was never told it was cancelled and literally just in the last week got a refund. In that time I have ordered a regular 16" MCX and 2 of the "kits".
Originally upon placing my first order, I was told the kits all came with a barrel, bolt and hand guard as well but now it appears to literally be just the barrel. Due to this huge 2 year delay I missed out on the 20% coupon deal they were offering on registration which is when I was planning on pre-ordering my kits, so that was a bummer.
I was also told the 9" 7.62 is also canceled and the plan is an 11.5" 7.62 eventually. If that ever becomes more than vapor ware, I will probably drop even more money on this gun and get one, but that would have to come with a bolt and maybe a mag one would assume. So I am hoping to order one ASAP if they open orders at the current price because they are already so inflated that I can only imagine what a barrel with bolt might cost if they raise the kit cost.
Like so many other people I fell in love with this gun and unfortunately I am pot committed at this point. While waiting for my SBR I bought a matching MPX, every stock option they sold, all the bags, etc. Well then the MCX 9" SBR got cancelled and I had to find a different gun. I had already bought the Tele/Folding stock as originally MCX's came with the Kate Moss skeletonized stock. Well now they ship with the stock I already have so luckily my wife found a previous version during my wait and let me get that "just in case". Well she was right! Thankfully I did.
~SP