The Armaspec® AR-10 Gun Builder’s Lower Parts Kit comes with almost everything you need to build your AR-10 lower receiver. This kit includes 1 Armaspec SFT 45/90 safety selector, 1 bolt catch, 1 enhanced takedown and pivot pins, 1 stainless steel takedown detent, 1 takedown detent spring, 1 stainless steel pivot detent, 1 pivot detent spring, 1 stainless steel anti-walk trigger/hammer pins, 1 stainless steel buffer retainer, 1 magazine catch, 1 magazine spring, 1 enhanced magazine release button, 1 stainless steel bolt catch detent, 1 stainless steel safety selector detent, 1 bolt catch pin, 1 bolt catch spring, 1 buffer retainer spring, 1 selector detent spring, and 1 hex key for anti-walk pins. Pistol grip, trigger and hammer, trigger and hammer springs, disconnect, disconnect spring, trigger guard, and roll pin NOT included. Backed by a lifetime warranty. Made in USA.