That's why I said "more than likely" - since a goodly amount of the items I've ordered were shipped directly, per my invoices...
Nope. Not more than likely. Way less than likely. Not only does Amazon warehouse their own inventory, they are in the B2B business of warehousing the inventory for Amazon Marketplace sellers as well.
Where JIT works great is in providing lots of identical parts to manufacturing where the part supplier specializes in a few items or types of items so completely that they are more efficient at building/procuring/sourcing those parts than the ultimate manufacturer can be - since the manuacturer's business is, for instance, making cars, not piston rings. In that way, I mean with the very specialized and efficient part maker, everyone focuses on what they do best. Without this specialization efficiency the manufacturer of the car may as well make all of the parts.
And it is this specialization that Amazon's business model is lacking from a JIT perspective. But there is specialization in Amazon. Their specialization is, in fact, warehousing and shipping. I buy from Amazon because I can get anything I want, just about, shipped free in two days. The reason I deal with Amazon is their warehousing and shipping specialization.
Now, back to ammunition. I don't know if it was in this thread or even in this forum that I posted it (and I'm not going to search it out) but I posted a link to an analysis on a gun blog that was very interesting. If you take the ammunition production levels before Obama became president, there's one box of .22LR ammo for each 8 gun owners in America. In normal years, that has been plenty. All that is needed for a shortage like we have today is for one of 7 gun owners to look to buy a box of .22LR ammunition and there would be a backorder of more than 10 million boxes.
As for JIT and ammunition, those who are crying about shortages are an example of the risks of JIT. If one step of the chain breaks down your spot in the chain is left short. But it's not the chain's fault. If you chose to buy ammunition JIT then you chose to be in the spot you're in today (and I mean the generic
you, not any specific individual in or out of this thread).
If you (same generic
you) decided you could not live with the shortages JIT could bring, and you chose to create your own warehouse space (cabinets in the garage?) and to warehouse your own materials, rejecting the JIT model for ammunition supplies, then you would not be feeling the effects of this shortage very significantly.
Personal choices... Wanted a gun but put it off until Obama made you realize you need to get one now or maybe never and now you need ammunition for it. You had your guns but only a small amount of ammunition now you want/need more. You have 100,000 rounds but you'd like to have 250,000. All personal choices over which supply and demand left you in the lurch.