Smith & Wesson AR-15 Complete Lower Parts Kit. All that is needed is a stripped lower receiver and stock assembly of your choice. Specifications for Smith & Wesson AR15 Complete Lower Parts Kit: Manufacturer: Smith & Wesson Gun Model: AR-15 Features of Smith & Wesson AR15 Complete Lower Parts Kit Includes: Bolt Catch Bolt Catch Plunger Bolt Catch Roll Pin Bolt Catch Spring Buffer Retainer Buffer Retainer Spring Disconnector Disconnector Spring Hammer Hammer Pin Hammer Spring Magazine Catch Magazine Catch Button Magazine Catch Spring Pistol Grip Pistol Grip Lock Washer Pistol Grip Screw Pivot Pin Pivot Pin Detent Pivot Pin Detent Spring Selector Selector Detent Selector Detent Spring Trigger Trigger Guard Trigger Guard Roll Pin Trigger Pin Trigger Spring Package Contents: Smith & Wesson AR15 Complete Lower Parts Kit Smith & Wesson 1085634: AR-15 Complete Lower Parts Kit