Matador Arms Mag-X G17/G19 Conversion Caliber Black. Specifications for Matador Arms Mag-X Conversion Caliber: Manufacturer: Matador Arms Color: Black Finish: Anodized Fabric/Material: Aircraft-Grade Aluminum Gun Make: Glock Gun Model: Glock 17 Glock 19 AR-15 Caliber: 9mm Luger Magazine Capacity: 0 Round Magazine Type: Pistol Magazine Included: No Condition: New Features of Matador Arms Mag-X Conversion Caliber No modifications required to your lower or magazine. Installs in seconds. Built-in magazine release. Only compatible with mil-spec AR-15 lower receivers combined with a 9mm upper with a Glock-cut bolt. Locks into place with the standard AR-15 catch. Lightweight aircraft-grade aluminum construction; anodized finish. Steel ejector and magazine catch. No last round bolt hold open. Hand-fitting may be required with FM-9 uppers. The MagX will not work with the CMMG Radial Delayed Blowback. Package Contents: Matador Arms Mag-X Conversion Caliber What firearm models does the manufacturer say Matador Arms Mag-X Conversion Caliber is compatible with? The manufacturer says that Matador Arms Mag-X Conversion Caliber is compatible with AR-15 Glock 19 Glock 17Matador Arms MAC138: Mag-X G17/G19 Conversion Caliber Black