Zev Technologies Match Grade drop-in Glock replacement barrels are manufactured with pre-hardened chromium stainless steel (416R). This material provides high tensile strength and toughness to withstand typical chamber pressures while still being highly corrosion resistant. It comes packaged in a box with foam inserts. This threaded model is compatible with Glock 19 Gen1-5 and has a stainless steel finish with dimples.