LBE Unlimited ARFSBKIT Front Sight Unlimited Base Kit for AR-15 Black
https://www.tandktactical.com/shop/706612407830-lbe-unlimited-arfsbkit-front-sight-unlimited-base-kit-for-ar-15-black-25961
https://www.tandktactical.com/web/image/product.template/25961/image_1920?unique=d1f21cc
AR15 Complete F Marked Front Sight Base. Kit Includes: Taper Pins, Sight Post, Detent, Spring, Swivel, Swivel Rivet. All parts are Mil-Spec.
