Gun Nuts Gi Style - Lower Parts Kit. Specifications for Gun Nuts Gi Style Lower Parts Kit: Manufacturer: Gun Nuts Finish: Phosphate Fabric/Material: 8620 Steel Gun Make: AR Platform Trigger Pin Size: 0.154 in Weight: 0.557 oz Features of Gun Nuts Gi Style Lower Parts Kit Traditional Government Issued Semi Auto Mil Equivalent Phosphate Trigger / Hammer. Package Contents: Gun Nuts Gi Style Lower Parts Kit Gun Nuts SI-LPK-P2: Gi Style - Lower Parts Kit