This is another two-piece barrel, with the muzzle brake in brass. I slipped it onto the aluminum barrel for the above scan. Although there are relatively few models that this barrel can be used for (SU-152 and ISU-152), it is a necessary piece for both of them. Both the PST ISU-152 and the ARMO SU-152 kits have horrible barrels included, and the intricate muzzle brake is done particularly poorly on both of them (the Leva SU-152 is a little better, but could also benefit from this piece). This set from Aber is fantastic, and will look amazing when painted.