It happens to all of us. You lose your concentration for a second, and a spring goes flying. For those moments, it helps to have the Smith & WessonA(R) AR Oops Kit on hand. It includes all those commonly lost small pieces that you can't bear to lose. Keep this conveniently sized Kit in your gun room or pack, so you can spend more time building and less time going to the store. Includes: Bolt catch plunger Bolt catch spring Bolt catch roll pin Buffer retainer Buffer retainer spring Disconnector spring Hammer spring Trigger spring Hammer pin Trigger pin Pivot pin detent Pivot pin detent spring Takedown pin detent Takedown pin detent spring Selector detent Selector detent spring Trigger guard roll pin Magazine catch spring Order today!