Here is the new Rail Mounted Light from Streamlight, a company we prefer for mounted lighting solutions on our airsoft gear... "The TLR-3®X delivers powerful performance with multi-fuel battery capability, operating on either one (1) CR123A battery or one (1) Streamlight SL-B9® rechargeable lithium-ion battery pack. This compact weapon light delivers 500 lumens and 6,500 candela, providing exceptional brightness and beam distance for tactical applications.