Doublestar Corp. OOPS! Replacement Kit, For Most Commonly Lost Parts AR791 Sometimes parts go missing or need replacement. Don't be caught unprepared with a useless rifle and stand ready with the Double Star Oops! Kit. The kit fits easily in your range bag" backpack" and even in your pocket. Never say Oops! with the Double Star Replacement Kit. Parts included:4-Takedown detent springs4-takedown detents2- buffer detents2- buffer detent springs2- firing pin retaining pins2- extractor springs with bumper pads2- selector springs/ ejector springs2- selector detents