Armaspec .223/5.56mm Gun Builders Lower Parts Kit SS/Black. 223/5.56 is a premium option. These AR15 Lower Parts constructed by Armaspec come with anti-walk pins that preserve the quality of your rifle by keeping the pins from damaging the lower receiver. All included pieces in the Armaspec Tactical Advantage AR Lower Parts Kit are crafted out of stainless steel to ensure they are durable enough to match the strength of the rest of your rifle. The Armaspec Partial Lower Parts Kit for .223/5.56 contains high quality gun parts to complete your lower receiver or to replace damaged or lost parts. Please note that this is not a complete lower parts part kit. Rather it is a builder's kit. This kit does not include a pistol grip pistol grip screw and washer trigger and hammer trigger and hammer springs disconnect disconnect spring trigger guard and roll pin. Specifications for Armaspec .223/5.56mm Gun Builders Lower Parts Kit: Manufacturer: Armaspec Color: Stainless/Black Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Last Chance: Yes Country of Origin: USA Features of Armaspec .223/5.56mm Gun Builders Lower Parts Kit Includes Armaspec Enhanced Lower Parts Compatible with most AR-15 lowers Lifetime Warranty Package Contents: Armaspec .223/5.56mm Gun Builders Lower Parts Kit Armaspec ARM151-BLK: .223/5.56mm Gun Builders Lower Parts Kit SS/Black