You can't build a quality rifle without parts, so we've made it easy for you with the Seekins Precision Builders Kit. Our kit provides you with the integral parts needed to finish your lower receiver. Given the amount of personal preference that goes into choosing the perfect trigger, we have not included one in this kit. This kit features all of the Seekins Precision manufactured lower receiver parts as well as the pins and springs needed for assembly of your AR15 lower receiver.Included:    Enhanced Bolt Catch    Bolt Catch Roll Pin    Bolt Catch Spring    Bolt Catch Plunger    Buffer Retainer Pin    Buffer Retainer Spring    Mag Release Button    Mag Catch    Mag Catch Spring    Safety Selector Barrel 60/90 Degree    Short Safety Selector Lever    Long Safety Selector Lever    Selector Detent    Selector Spring    Trigger Guard    Trigger Guard Roll Pin    Seekins Precision Takedown Pins (2) pivot and rear *Only available in builders kit    Takedown Pin Detent (2)    Takedown Pin Spring (2)    Set Screw Hex    SHCS Hex (2)