Well that's interesting! I have never heard of or seen that before
edit: just looked up that BB pistol - that thing looks to be incredibly hard to track down and if you do, they seem to pretty pretty expensive lol where did you pick that up?
Gift from my father in law. He was cleani g up and said it didn't work any longer, he didn't need it, figured I could make a cool blaster with it.
There's a few on eBay for decent price now, just quickly looked and there's even a pair for $35 or so. Others are a fortune thou lol. One was $125.