Opis

Hop Up Unit made of aluminium by Prometheus for M4 and M16 models. As usual with Prometheus, no compromises are made with this product, the highest possible quality is guaranteed. In contrast to conventional hop-up units, this one has an additional O-ring between the magazine and the hop-up chamber to ensure the greatest possible tightness. For some weapons, the outer barrel must be slightly modified so that the unit fits.