Kunlun pondering

I’m considering preordering a Kunlun from OOD. If I do go through with it, I’m thinking of making and mounting an underbarrel blaster on the bipod mount. I’m having trouble deciding what type of underbarrel blaster to go with. Rival, short darts, 40max (geometry), mega, any ideas are welcome. The picture is just to demonstrate the idea.

I’m considering preordering a Kunlun from OOD. If I do go through with it, I’m thinking of making and mounting an underbarrel blaster on the bipod mount. I’m having trouble deciding what type of underbarrel blaster to go with. Rival, short darts, 40max (geometry), mega, any ideas are welcome. The picture is just to demonstrate the idea.