If your Master Piece Arms is set up to work with Sten 9mm Magazines and you want the texture and finish of a parkerized magazine, then this is the product for you. These are the original Pre Ban mags that have been refinished, reworked, and parkerized. Each magazine is inspected and checked for smooth feeding for use in Semi Automatic Master Piece Arms guns. They can be shipped as rebuild kits, please call if you have any questions on which mag works with your gun. Also available as a rebuild kit. We recommend the NEW speed loader with this magazine. You can find it under the SPEED LOADERS section.