Apologies for not responding much to my own thread, but I have been appreciating and soaking in the vast quantity of info and insight here.
I guess at the end of the day, the answer is "it's made of bloody lego who cares"; I see stuff like "laser railguns" and such that are pretty much sci-fi techno-babble jargon. but I am seeing cased rounds in a better light now. I guess I just wanted to be unique and special, and relive my Aliens fantasies *shrugs*
this does lead me to a sort of similar question though: What caliber are these weapons, on average? I guess I could math it out by measuring the legos by plates and comparing that to size of the average man (I believe that is what "7p" is in reference to). I understand a lot of creative license is to be used, since lego parts don't really come in large variety of diameters; I main one that comes to mind is the thickness of a . I do not know too much about such measuerments, but I would assume by necessity the "stud end" hole of a would be ever so slightly larger. I guess the size of your standard "technic hole" is probably worth knowing too.
I ask because I certainly want some realism of scale, even if what's coming out of the hole is nonsense
I see measurements around the forum from 45mm for a cylinder hole to 105mm for about 'rod' thickness (though to be fair, they may have been using different scales, but I assume if no scale is given it's probably 7p).