AR-15 Lower Receiver Question?

I am looking at building a AR-15 since i have a spare barrel and stock etc from my first one and i wanted to put the parts to use. and i need a lower receiver (i know a store has to order it and background check has to be done for it) but i was looking for a cheap receiver and was hoping that you guys could give me... show more I am looking at building a AR-15 since i have a spare barrel and stock etc from my first one and i wanted to put the parts to use. and i need a lower receiver (i know a store has to order it and background check has to be done for it) but i was looking for a cheap receiver and was hoping that you guys could give me a link to one. to be clear i can still have them order it at 18 there is not restriction for receivers on me being 18?
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