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: Takedown detent springs, takedown detents, buffer detents, buffer detent springs, firing pin, retaining pins, extractor springs with bumper pads, selector springs/ejector springs, and selector detents. Features: Replacement parts For builds or repairs Pins, springs and detents