VFC MP5 Hopup Arm and Nub V2 vipertech Cap only comes with combo

Cap only comes with combo package

I would highly recommend utilizing HPA with this recoil spring as I have done zero testing with regular propane gas

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

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

VFC MP5 Hopup Arm and Nub V2 vipertech Cap only comes with comboThis 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!