Fire control group and grip NOT included. CMC Triggers Complete Lower Receiver Parts Kit for AR-15 is a great addition to your AR15 build. Suitable for amateur gun builder to seasoned expert gunsmith. Bolt Catch Bolt Catch Plunger Bolt Catch Spring Bolt Catch Roll Pin Mag Release Mag Release Button Mag Release Spring Buffer Retainer Spring Safety Buffer Retainer Safety Detent Spring Safety Detent Trigger Guard Trigger Guard Roll Pin Take-down Detent Springs Take-down Detent Take-down Pins