VFC MP5 Hopup Arm and Nub V2 vipertech I would encourage you to

I would encourage you to complete this piston by buying Bavtechs Brass piston to complete this

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

To give you potentially essential information I measure each catch several times and write down the exact height of the catch surface on packaging

-Black Nitrided

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

VFC MP5 Hopup Arm and Nub V2 vipertech I would encourage you toThis 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!