what is an ar 15 80 percent lower

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Type III Hard Anodized Billet AR-45 80% Lower Receiver
Rated 5.00 out of 5
Original price was: $140.00.Current price is: $135.00.
Raw Billet .308 80% Lower Receiver - Blemished Original price was: $120.00.Current price is: $115.00.
Black Anodized Billet Lower Receiver - Blemished
Rated 5.00 out of 5
Original price was: $140.00.Current price is: $135.00.
Bead Blasted Billet .308 80% Lower Receiver
Rated 5.00 out of 5
Original price was: $135.00.Current price is: $130.00.