Strike Industries Lower Receiver Spring Kit AR-15/M4 Black AR-Platform ARLRSK

Tool box comes with 20 each of springs used in AR-15 lower receiver: bolt catch spring, buffer retainer spring, trigger spring, hammer spring, disconnector spring, magazine catch spring, selector spring and detent spring. Ideal for department armorers, retail gun shops, or anyone else who works on, builds or repairs large numbers of AR-15s. Clear plastic box features snap lid and separate compartments to keep springs organized.