well at least you came home with something
keep the chin up and your eyes open on the equipment exchanges in some of the AR forums. there's always something coming up for sale. the only problem is...you have to be right there when it does, because everything today is going faster than it came in, and beware of the gougers.
most of the parts that you see for sale in the equipment exchanges, were just purchased from one of the vendors, sometimes the very same day, at INFLATED prices
but that's AMERICA and capitalism.
keep an eye on sites like PKFirearms, Bravo Co., etc, as they have been getting parts in lately, but like I said, they are gone like the wind if you aren't there.
post some pics of the new toys when you can, and good luck on the search.