pitcure of swarm fire and whats the guy in the tires holding?

in this picture you can clearly see the "swarm fire" but whats that other gun??? looks like a raider but not at the same time it looks like the raider with stampeade grip and bottom loading Nerf clip! a clip? but cant you only use streamlines? i know that but people mod longshots to fire taggers so maybe Nerf just did that. leave your comments if you see any missed details