Zev Technologies Match Grade drop-in, Glock compatible, barrel features extremely tight tolerances and is manufactured with pre-hardened chromium stainless steel. It provides high tensile strength, toughness, is highly corrosion resistant, and is double honed. This threaded model is compatible with Glock 19 Gen 1-5 and has a black DLC finish with dimples. It comes packaged in a box with foam inserts.