Dynamic Precision Next Gen Blowback Housing For TM Hi-Capa ( BK ) We have push beyond the limit to further reduce the weight of the housing. A fully skeletonize aircraft grade aluminum 6061 housing with a new plastic cylinder. The new plastic material is ultra tough, lightweight, anti-scratch, anti-freeze and excellent durability. It has a low friction characteristic which can smooth the action to the nozzle and prevent scratches to the aluminum nozzle due to heavy use. The whole unit is only 14.6g (without screws). Perfect for competition shooters demand for extra stability and durability. Available in silver & black color. Installation: Apply screw glue to the screw which hold the plastic cylinder.