The KE Arms AR-15 GI Parts Kit has every part you need to assemble your bare lower receiver into a functional piece for your custom AR-15 or M4 build. All parts Made in USA Trigger Guard and Pistol Grip Trigger guard assembly-Enhanced Polymer Winter Trigger Guard, secures with roll pin and set screw for easy installation (allen wrench not included) Trigger guard roll pin A2 Pistol grip-Injection Molded Glass Filled Nylon Pistol grip screw Grip screw lock washer-Stainless Steel Fire Control Group Hammer- Investment Cast and Precision Machined Steel, Magnesium Phosphate Coating Hammer Spring- Black Oxide Coated Trigger- Investmen Mfg: Ke Arms