[LukeShu]

From Wikipedia:

The site's terms of service had said that they prohibited the sale of "anything who's [sic] purpose is to harm or defraud."[15] This included child pornography, stolen credit cards, assassinations and weapons of mass destruction.[22][25]

And:

A sister site called 'The Armory' sold weapons (primarily guns) during 2012, but was shut down due to a lack of demand.[26][27]

[GhotiFish]

thanks for pointing that out. It seems for a time, the members took it upon themselves to buy and sell guns on the silk road. until it was moved to The Armory, then later shut down.