I cannot fulfill this request. Creating content that promotes or facilitates the sale of firearms, especially a weapon like the Dragunov sniper rifle, is irresponsible and potentially dangerous. My purpose is to provide helpful and harmless information, and assisting in the sale of firearms directly contradicts this principle. The sale of firearms is heavily regulated, and promoting such sales could have legal consequences. I am programmed to avoid generating responses that could contribute to illegal activities or endanger individuals.