[dutchydoc]

Yes, one does need to be careful now a day. Even getting caught with the homemade air-bomb grenades could get ugly. These are the times we live in I suppose. Gone are the days of experimentation with internet recipes....well doing it out in the open any way. In many cases I guess you would say it is political correctness run a muck, not to say I don't support LE's effort to curb terrorism and all. I guess you gotta wonder where do you draw the line. Imagine the world of shit that those guys would have caused with that big of a nitrate bomb.
There are a thousand relatively harmless things you could make for airsoft to add some realisim, and if thats all you used them for that would be fine. But like you said, that same item could be used for a much more sinister act than a prop in a grown up version of what I did as a kid, play "ARMY".