.This is the old style Tippmann A5 flatline barrel system. The newer flatline and this flatline work the same. The curved barrel will put a backspin on the paintballs. This allows for flatter trajectory and longer range. Realistically, the range added is about 50 feet. This barrel has a round metal housing while the current version is plastic and has rail mounts. This is a brand new "old" stock find. Once these are sold, no more will exist.