The Maple Leaf CNC aluminum hop up set for the GHK 553 GBBR is an upgrade from renown upgrades parts maker Maple Leaf. Maple Leaf has years of technical know-how when it comes to making all things hop up.
The set itself is full CNC and made from aluminum means its both lightweight and durable. It comes with one of its high quality rubbers.
Disclaimer: All aftermarket upgrade parts require necessary skill or modification to install and assemble, please consult with your airsoft technician if needed.