What good are gun parts?
Quite a few reg readers, as in most by far, live in places where guns are very restricted, and as such a collection of parts missing the vital bits isn't merely useless, it's useless and bothersome
Useless because for a working gun you need at least a barrel, and you can't really make one of those out of plastic. Even in leftpondia it's more a political statement than anything else, yet anyway. It works as a political statement there because the lower receiver "is" the gun, as far as relevant law there is concerned. All the rest down to barrels is more or less unrestricted. Doesn't work quite that way just about anywhere else.
And it gets worse. Over here, if you're accosted by pc plod, and you have anything vaguely suspicious on your person --anything suspicious-ish, like a large wad of cash for example, will do-- they will *also* search your home. Anything they find there is fair game. They find gun parts, hey, they'll insist you must have the rest too, for why else do you have thispart? Then they *will* arrest and interrogate you, at their leisure. And issue a press release they've managed to stop a would-be terrorist in his tracks. So why keep a useless curiosity around?
It doesn't have much to do with pacifism, instead quite a lot with relevant law and plod practice.