cowcow 3l hi capa hop up kammerThe Hop Up chamber here is made of 7075 aluminum and is CNC cut. It comes in a lightweight design and has a new redesigned structure that provides extra support in the lower part of the chamber. The design provides better precision and consistency in your shots. Because it is made of aluminum, it is also quite durable. The hop up chamber itself sits well in the frame. It fits the Hi Capa models from TM as well as their TM 1911