Absolutely the easiest way to keep genuine Mil-spec AR-15 replacement parts in your shop and available for your customers. AR-15 Pin Kit contains one each of the following pins: pivot pin, takedown pin (not mil-spec), hammer/trigger pin, bolt catch pin, forward assist pin, triggerguard pin, gas tube roll pin, extractor pin, ejector pin, firing pin retaining pin, A2 sight roll pins (3), takedown/selector detents (2).