The Maztech X4 Diving Board Mount allows you to mount your X4-LRF(TM) above the X4-FCS(TM) or your preferred 30 mm scope. The X4 Diving Board Mount is compatible with ?Geissele(R) Super Precision(R) and Reptilia(R) AUS(TM) 30 mm mounts - simply replace the front scope ring with the Diving Board. The X4 Diving Board Mount has eight (8) standard Picatinny rail slots for supplemental mounting of any rail-mounted accessory, if desired.