The Rise Armament AR-15 Customizable Lower Receiver Parts Kit provides most of the mil-spec parts generally used in an AR-15 build, while still allowing the flexibility to add common aftermarket upgrades, such as a pistol grip and match grade trigger components. Customizable lower parts kits offer an economical way to get all the small pieces needed for an AR-15 lower, without wasting money on the parts you won't use!Kit Includes: Safety detent pinSafety detent springMag catchMag catch springMag release buttonBolt catchBolt catch springBolt catch plungerBolt catch roll pinPivot pinTakedown pinPivot/takedown spring (2 pcs)Pivot/takedown detent (2 pcs)Buffer retention pinBuffer retention springStandard trigger pins (2 pcs)Standard safety selectorDoes NOT Include:Pistol GripPistol Grip Screw and WasherTrigger or HammerTrigger and Hammer SpringsDisconnectDisconnect SpringTrigger Guard or Roll Pin