Madbull Airsoft Ras Rail Mount Type 1
The RAS rail system on the real firearms is fixed on by via gas tube.
AEGs don't have gas tubes to connect both RAS and upper receiver.
RAS FIX is a new product which mounts on both the upper receiver and RAS. It will make your RAS and upper receiver connected tightly.
It can also be used as a scope riser mount.