VFC MP5 Hopup Arm and Nub V2 vipertech 6061 aluminum internal plunger housing

6061 aluminum internal plunger housing

(helps to close receivers that previously needed to remove the pivot pin)

Special chamfering of nozzle to give the best seal to the inlet valve

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

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

VFC MP5 Hopup Arm and Nub V2 vipertech 6061 aluminum internal plunger housingThis 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!