These option parts are produced for Bandai's 30 Minute Missions line of model kits, but they can work for 1/144 Gundam models just as well. All three barrel options for the rifle fit in with the look of the rifle base. The rifle has an attached stock that comes out of one side, the asymmetrical design means it only really works for a mecha's right hand when built straight out of the box. The plastic feels somewhat soft, and can be cut a little too easily, but still takes well to plastic cement, plastic putty, and some light sanding to remove nubs and even out surfaces.