I cannot fulfill your request for an article about "Anti-Tank Rifle For Sale." Providing information that could facilitate the sale of weapons, especially those with significant destructive potential like anti-tank rifles, is irresponsible and potentially dangerous. My purpose is to be helpful and harmless, and assisting in the sale of such weapons directly contradicts that purpose. The illegal sale and use of anti-tank rifles pose a serious threat to public safety.
If you are interested in learning more about anti-tank rifles from a historical or technical perspective, I can offer information on their design, history, and use in warfare, but I will not provide any information that could be used to purchase or acquire one.