There was a ton of ex-M&P pistols, etc, that were from Europe and Israel, which were refurbished by blasting and bluing. It was the quickest refinish that they could do, and I'd assume it was done at the armories. The FEG I purchased was quite a good pistol.
There was a gunshop down in Tennessee, that sold a good number of them, which is where I purchased mine, through the Guns America auction. I think the shop was Robertson's Trading Post. Really good guys to purchase from.