The metal hopup has an outer diameter of 10mm, a length of 60mm, and a depth of 13mm. It can be hidden in the standard inner tube 11mm and non-standard concave-convex tubes, or in all fire caps, without reaming. This hopup has no sinking design, and most sights are easily reset to zero.
Hopup is a set of four. The four hopups have different friction textures and angles, and can adapt to launchers with different muzzle speeds, air volumes and spring diameters.
