TacFire SSRK300LPK AR Build Kit Rifle 300 Blackout AR Platform Black Nitride Aluminum 1/2"-28 tpi *Sports South Exclusive. $494.48
TacFire SSRK556LPK Lower Parts Kit Unassembled Rifle Kit 223 Rem/5.56x45mm NATO AR Platform Aluminum 1/2"-28 tpi $395.30