No, silk road did not sell weapons. There was legal content like pornography and other media on there, but Ulbricht was an idealist and excluded material with "intent to harm".
Notably, as Ullbricht predicted, the Silk Road was immediately replaced by sites which did not have such ideals, and openly sold weapons and illegal pornography.
plus in North America you don't really need a darknet market to get a gun illegally. US FedGov ain't gonna get to involved in illegal gun sales in Europe.
Interesting and surprising they really had rules, thanks for the clarification. I'm ashamed to say I opened this page and read it wrong the first time by skipping the first sentence.