Im looking into 3 round burst fire by relocating the T piece, and making 3 and 4 barreled rscb's for shotgun style uses. An automatic nerf shotgun would be pretty fun wouldn't it? (although you would go through darts extremely fast)
WOW! I am actually working on a very similar type of thing now. I have put the Mirage 2.0 on hold (due to annoyingly bad shipping, which resulted in smashed brass), and have begun work on a semi automatic scatter cannon based on the Mirage-ss!
I really look forwards to seeing your build now. I always figured a fun challenge would be simply to try and fling as much foam as possible towards the opponent, I imagine some sort of massive wall of foam