New HK German MP5 & HK94 A3 "F" style retractable rear stock. This is the latest & greatest HK retractable German stock available. The F stock is designed to take the abuse of heavy +P & +P+ rounds as well as all standard ammunition types. The MP5F stock will fit all HK MP5 & HK94's including 9mm clones. The MP5 F stock also has an upgraded buffer system and rubber buttpad that adds about an inch to the overall length as compared to the older style A3 MP5 stocks.