Kit Includes: UR-31 Rear Base Elevation Knob Spring UR-05 Ejection Port Cover Spring LR-32 Hammer Spring UR-07 Forward Assist Spring LR-22 Trigger Spring LR-16 Magazine Catch Spring FS-04 Front Sight Spring BT-05 Selector Spring LR-26 Selector Spring LR-31 Disconnector Spring LR-09 Bolt Catch Spring BT-08 Extractor Spring Assembly