The oops Kit comes with the Springs and Detents that can easily get misplaced when you are installing them and/or replacing them. This kit is retail packaged. Included in this Oops! kit are the following items: (1) Hammer spring (1) Trigger spring (2) Hammer/trigger pins (1) Disconnector spring (2) Takedown/pivot pin detents (2) Takedown/pivot pin springs (1) Safety spring (1) Safety detent (1) Magazine release spring (1) Bolt catch plunger (1) Bolt catch roll pin (1) Bolt catch spring (1) Buffer retainer (1) Buffer retainer spring (1) Trigger guard roll pin