https://www.tokyo-marui.co.jp/products/new/#productsNew-Calendar Here's the link. The reason I'm saying it is, as far as I know TM doesn't directly supply retailers, but ships to distributors who then sell to stores. It's likely a distributor had leftover g17.4 and g18c they didn't sell originally which were now sent to stores (and TM didn't say anything about new shipments)