This is a one off custom made in house Pooty aluminum upper tube. This only works with SKP upper mounts. This is only the tube. You would use your stock SKP upper tube mount and front site with this. This is the normal 155mm length. This aluminum tube was fully polished gloss. Then custom anodized with a voilet splash and fade with a marble base. It also has in light blue the SKP Skull logo. The front has holes drilled on the top and bottom. This lets you use a site or no site for flat top look. This is the only one made on its own. the other one made goes on our marble SKP build that is also for sale. Left hand Hopup window for a stronger and cleaner tube.