Guarder Bore-up Super Lucid Chromium Plating Cylinder for Airsoft AEG Gearboxes (Model: Type 0)

"This is a great replacement or bore up cylinder. Let me explain, it is a good bore up cylinder since the chrome plating is so smooth, there is less friction from the piston and piston head. After putting this in I got about a 10-13 fps increase, compared to my stock brass cylinder. It is a part that a lot of people overlook, but it can make all that more of a difference when upgrading fps. 5 out of 5