The LBE Unlimited ARESNTL is a US-manufactured AR essentials kit that proves to be an ideal choice for your forthcoming build project. It\'s also a valuable kit to keep around for servicing your favored AR. Key features of the kit include a Bolt catch plunger, Bolt catch spring, Bolt catch roll pin, Buffer retainer, Buffer retainer spring, Disconnector spring, Hammer spring, Trigger spring, and Hammer pin. These elements work collectively to ensure the smooth operation and longevity of your AR.