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

"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

"I have bought 3 of these for the hi capas I have built and I have no complaints, these are great especially for the money, I’m going to continue buying these for my future builds, highly recommend

"I got this for my WE hi Capa and I can't complain! This is way better than the traditional design because of the one piece metal retaining nub. Applies plenty of hop for .32g+ bbs

"I bought this because I've had the small plastic block (part #71) eventually break off a few times. This chamber set provides that piece function already built-in. Yeah, you've gotta pry the inner barrel assembly from the outer barrel or can try unscrewing beforehand but you have a more durable setup. My only issue is its compatibility is hit-or-miss with some guns. I have a normal WE 4.3 hi capa and there would be too much play when assembled. This would allow the outer barrel to move more when the slide actions, making it jam against the top of the inner slide. Sanding the outer barrel didn't quite help. But installed in my WE Allosaurus, there is no jamming. I've ordered two Set B and one Set A and they seem to be the same dimensions. Just be aware the fit may depend more on the gun.