So I was having a conversation with a friend of mine about our state's silly gun laws, and the subject of 10 rd. handgun mags came up. He was trying to tell me that buying and owning a handgun magazine kit that could theoretically could hold more than 10 rds. is illegal. I was trying to say that owning a magazine kit is the same as possessing gasoline, a bottle and a rag. In their separate forms they're perfectly legal to own, however, as soon as you construct them into a Molotov, then you constructed an illegal device. Likewise, just having the parts to say a 33 round Glock magazine is legal, but as soon as you put them together, then you've broken the law.
So who's right here?