Timerzanov Airsoft reviews the G36C EBB with EFCS from Umarex with Ares Airsoft as OEM... "Hi all ! Today we are going over the G36C EFCS from ARES/UMAREX. Faithful replica of the H&K G36 Keymod used by the police for the fight against terrorism, this replica will surprise you with its quality and finish. Umarex has joined forces with ARES for the gearbox which uses the EFCS system, so you can program your replica with Burst mode using a box sold separately."