RA-Tech Maple Leaf Aluminum Hopup F Key Spacer / Tensioner for WE GBB Pistols

"This little thing increased the range of my we hi capa buy around 40-45 feet. the way it works is it goes under the hop up arm to aply even pressure on the bucking. i purchased this because the hop up arm was always veering to the left so the bbs always swerved, this corrected that. i would definetly recomend this for only 7$

"Installed this in my we hi capa ng3. Had to file it down to fit properly but it is amazing. Made my gun much more accurate and range improved dramatically. Only fits newer generation we hop ups with narrow gap in hop arm. Best 7 dollars ever spent.