This magazine extends the round count of Tokyo Marui's Hi-Capa series noticeably and is likewise filled with Green Gas. The elongated body is made from a metal alloy with a polymer base pad and drops into a Hi-Capa grip frame like a standard magazine.
An exposed BB channel runs along the housing so the remaining fill level can be read at a glance without pulling the magazine. A tensioned spring keeps feeding steady even through fast strings of fire.