Awesome!

So, Bang-You is Stray Bullets?

Considering the other posters of this style are more obviously airsoft adverts(they blatantly state a prominent Japanese airsoft company), I'll leave tagging this one up to someone else, as this particular image does not say Marushin in plain English, or other any details leading to evidence that this is advertising an air-gun, other than the fact that similar images do state so.