I looked over their ebay listing, and if you flip through their feedback you'll see all they ever sold is volume cap covers for the ak100/ak120. It makes the auction seem all the more suspicious, and with a minimum price of 740 bucks, who in their right mind would buy it, especially from a seller who may or may not have actually ever sold one (the jury is still out on that). I'm sorry, but the price is hilariously high, I'm not really sure whats in this mod that would warrant a 540 dollar premium over a stock x3. Just my two cents, however.