Re: Changes at Midway?
MidwayUSA, in my experience, has never been a great source for stripped AR receivers regardless of platform. While they have a sizable variety of other AR parts/accessories, I wouldn't start looking there if I was in need of a receiver.
If you post up exactly what you are in need of, I or others here can probably point you in the right direction for parts, but as has already been said...finding major components/receivers in stock and ready to roll right now isn't going to be an easy task depending on what you need.