Quick view USMC logo'd Lower Receivers With Achilles Stock Specifications: Caliber: .223 / 5.56 / 300 AAC / 7.62 / 350L Lower: Complete Lower(semi automatic) Stock Kit: Achilles Stock Spring and Tungsten 2.5" Buffer Material: 7075 T6 Aluminum Color: Black -... MSRP: Was: Now: $299.99 Add to Cart Compare