DP Aluminum Hop-up Chamber for TM G17/G18c. Constructed with aircraft grade 7075 aluminum which give a superb durability. Manufacture by precision CNC to ensure the chamber is in tight tolerance for perfect concealment for hop-up rubber and inner barrel. Improved design to increase the accuracy over the stock chamber. The contact point (pin) of the outer barrel and the chamber was made of stainless steel which can resolve the wear out problem due to heavy use. Finished with hard black anodize to provide an extra protection to the chamber and laser marked for the hop-up adjustment indicator.