PDI CNC Machined Duralumin Alloy Precision Hop Up Chamber Ver.2
(Type: VSR-10)

"bought one of these for my snow wolf m24. the instructions are in japanese so i used google translate on my phone and took a picture. came with all necessary hardware, you will need electrical tape! when installing o rings the smallest one has to go inside where the nozzle goes. this part is super hard and requires large amounts of patience. you will get frustrated. it has two little arms for adjustment so you can precisely adjust your bbs going left and right and this can potentially work for adjusting windage. inner barrel i used was an angel custom 6.01mm barrel for snow wolf m24s, i used this because the snow wolf m24 has a odd barrel length. once you set up every thing there is a cone shaped spring that goes on top of the small flaps and to keep it in place you need some electrical tape. THIS USES AEG RUBBERS/BUCKINGS. adjusting the hopup on this you need to use the 1mm allen wrench it comes with. you need to take the mag out every time for adjustment so its a pain. again you need patience with this. if you're willing to put the time and effort in this product in making it work, it can make your rifle's shooting a whole lot better. i think this hop unit is worth it. it is expensive but what you're getting is worth it to me. i can answer questions in comments