The RISE ArmamentA(R) 20-piece Lower Parts Kit has all the must-have components you need to assemble a mil-spec AR-15 lower. You get all necessary working components of a lower, minus the trigger. Most components are made from industry-standard 8620 carbon steel, and feature a rugged black phosphate finish for superior corrosion resistance. Details: Includes all working components of a lower receiver, minus the trigger Compatible with mil-spec AR-15 lowers Most components are made from 8620 carbon steel Most components feature a black phosphate finishIncludes: (2) Takedown/pivot pin detents (1) Bolt catch spring (1) Safety detent pin (1) Bolt catch plunger (1) Bolt catch roll pin (1) Buffer retention pin (2) 5.56 trigger pins (1) Safety detent spring (1) Spring for buffer retainer (2) Springs for takedown/pivot detents (1) Mag catch spring (1) Bolt catch (1) Safety selector (1) Mag catch button (1) Mag catch (1) Receiver pivot pin (1) Receiver takedown pin Order today!