Timber Creek AR Lower Parts Kit Burnt Bronze AR LPK BB. In addtion it it includes a mil-spec bolt catch and all the springs and pins needed. This kit is the perfect start to any build. CNC machined out of aircraft grade aluminum. Specifications for Timber Creek AR Lower Parts Kit: Manufacturer: Timber Creek Fabric/Material: Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Condition: New Hand: Ambidextrous Package Contents: Timber Creek AR Lower Parts Kit Mil-spec Bolt Catch Springs and Pins AT TPS Ambi Safty Selector AR Magazine Release Button Timber Creek AR LPK BB: AR Lower Parts Kit Burnt Bronze