A buddy of mine is going to be selling a Bushmaster (.223) complete AR 15 upper, standard handguard, A3 flattop with detachable handle, standard charging handle, standard A2 front sight. I don't know the twist or the barrel type but it's whatever came standard on a Bushmaster.. It would be a direct drop in for a completed lower. He's selling it because it was his father's who passed away recently. It has roughly 100 rounds through it. Just asking for a rough estamite in today's market.