Ergo 4971B Castle Nut Steel Black for AR-Platform
http://www.tandktactical.com/shop/810049123000-ergo-4971b-castle-nut-steel-black-for-ar-platform-34490
http://www.tandktactical.com/web/image/product.template/34490/image_1920?unique=a591aee
Works with Commercial, Military & Hybrid Buffer Tubes Fits: AR-15 and all AR Variants
