Yep, the whole BBMG scene on Spudtech and this site was built around spudsonfire's efforts to replicate the Strafer that this guy used to sell.
I do love how much people charge for these things, when basically they're clouds/strafers with some plastic stuck round the outside. Still the patent is interesting, and the other patents it refers to as well.
From the patent it looks to me like this guy really put a lot of work into the design an it is quite a bit more complicated than the BBMGs we make here.
However it does speak volumes for this community which has managed to make similar devices with extremely simple mechanisms, and in some aspects our designs perform better than commercial ones, such as the much greater range of firing positions possible with the spring and plunger assemblies.