VFC MP5 Hopup Arm and Nub V2 vipertech -Cutout for tension O rings

-Cutout for tension O rings specifically for open bolt guns such as the VFC M249

-Black Nitrided

The height may need slight adjustment to get the correct height

please note that the compression part of the spring should be connected to the nozzle pin while the tension part of the spring should be connected to the rear assembly that gets screwed into the back of the bolt

-4140 steel which means it is corrosion resistant

VFC MP5 Hopup Arm and Nub V2 vipertech -Cutout for tension O ringsThis arm provides more consistent hopup tension on the bucking for more consistent BB backspin. 7075 anodized aluminum. Rubber Nub. This new version is CNC machined rather than 3d printed. This hopup arm allows for the use of a rubber nub which will greatly improve your hopup consistency!