The Kondor Blue R5 Mod Kit: Long Side Rails attach to the standard camera cage and add to the accessory mounting options while keeping the battery grip attached.
They can be used as a replacement for the side rails in a cage using a set of M2.
5 screws.
Compatible with Canon BG-R10 battery grip, these extended rails feature multiple 1/4""-20 and 3/8”-16 mounting threads.