Our 18mm diameter base rails are under-sized for g3 and cetme recivers so the edges touch and they fit over the protrusion in the top of the stamping with out needing the bottom relief cut.
18mm base fitment
Our 18mm diameter base rails are under-sized for g3 and cetme recivers so the edges touch and they fit over the protrusion in the top of the stamping with out needing the bottom relief cut.