CMMG ZEROED AR-15 Enhanced Lower Parts Kit Black. Every piece is made here in the USA and comes in convenient color-coded packets to make assembly a breeze. Check out our interactive install walkthrough video below. Don't forget a Buttstock or Brace kit to complete your pistol or rifle lower. All parts meet or exceed mil-spec. All installation hardware included. Kit Includes: ZEROED Drop-In Trigger ZEROED Pistol Grip Five color-coded packets containing the following parts: Red Packet ZEROED Anti-Walk Hammer/Trigger Pins & Screws Yellow Packet ZEROED AR15 Bolt Catch Bolt Catch Plunger Bolt Catch Spring Bolt Catch Roll Pin Buffer Retainer Buffer Retainer Spring Blue Packet ZEROED Trigger Guard ZEROED Ambi Mag Catch ZEROED Extended Mag Release Trigger Guard Set Screw & Roll Pin Mag Catch Spring Green Packet ZEROED 60/90 Ambi Safety Selector Detent Selector Spring Pistol Grip Screw White Packet HD Pivot & Takedown Pins Pivot/Takedown Detents Pivot/Takedown Springs Specifications for CMMG ZEROED AR-15 Enhanced Lower Parts Kit: Manufacturer: CMMG Color: Black Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Package Contents: CMMG ZEROED AR-15 Enhanced Lower Parts Kit CMMG 55CA683: ZEROED AR-15 Enhanced Lower Parts Kit Black