Centennial Defense Systems Stainless Steel Trigger Housing Pin for Gen 1-3 Glock Blue. It is precision ground from high quality stainless steel to be a direct replacement for most Glock models with no extra fitting required. Specifications for Centennial Defense Systems Stainless Steel Trigger Housing Pin for Gen 1-3 Glock: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Model Generation: 3 2 1 Package Contents: Centennial Defense Systems Stainless Steel Trigger Housing Pin for Gen 1-3 Glock Centennial Defense Systems 20051: Stainless Steel Trigger Housing Pin for Gen 1-3 Glock Blue