Yeah. I've seen it and it looks like a mechanical nightmare haha. And I wanna say that they were fairly expensive. It's a very cool concept though. Once I get the Battle Rifle working in the AEG configuration, I plan to experiment with making a universal drop in gbbr kit for the BR and the MA5D AR that I am also working on. Just need to get a hold of an RA Tech burst trigger kit for the BR. But that's in the future. My main goal is to get the gbbr SR and the aeg BR working for the 2 day event.