Dissipator. Modeled after the Colt 605 dissipator from the Vietnam Era. This one basks a mid length gas system so it cycles properly unlike many rifle length systems with dwell time issues, 5.56 chamber, flattop receiver with FN A2 carry handle, 3-prong flash hider, Trijicon ACOG 1x24, no longer produced but has good yellow dot (old dot design with blue notch filter) Trijicon carry handle mount for the 1x ACOG, front sight rail mount for accessories, also has Genuine M16a1 Bakelite furniture from the Vietnam Era rifles decommissioned by the US gov. Triangular hand guard, A1 length stock (3/4 shorter than the A2, A1 pistol grip.