Guarder CNC Machined Aluminum Enhanced Hop-Up Chamber for Tokyo Marui Hi-Capa Gas Blowback Pistols
(Model: B)

"I'm running this hop-up chamber in two of my Hi-Capas at the moment. Huge improvement over the WE/AW chamber. I can hop .32's now with room to spare and I haven't had any fitment issues. I plan on fitting all of my Hi-Capas with these over time.

A note for anyone running this on a WE/AW Hi-Capa, you may need to file down a bit of the chamber to fit it into the outer barrel. There is a piece that unscrews from the stock chamber that allows the chamber to fit into the outer barrel. On TM spec chambers, that piece does not unscrew so it sometimes takes a bit of force to get them to go in.

"Put in my Custom 5.1 Hi-Capa. I got the B version and every single piece came as advertised and the hop-up itself works great. the wheel is stiff enough that you can move it by hand, but it won’t move while shooting. Overall, a good product.

"I have tried the AIP and Maple leaf brass hop-ups and this one is equal to them in performance and reliability, I use the Maple Leaf bucking and swap out the hop-up arm for the Maple Leaf ones. I have shot thousands of rounds through this using an HPA setup and have no complaints. If you're looking for good performance and to shed some weight in your build look no further. You can see this in action on my youtube page: https://www.youtube.com/watch?v=c3Whro4LnSw