F Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Omega Clip, K2 Lockdown, Black/Gold, LE-BLK-K2-GOLD $43.99 LEBLKK2GOLD show more like this Free Shipping on most orders over $49 Optics Planet F Fortis Lightweight Enhanced AR-15 Endplate System Version K2 - Gold $52.20 LE-BLK-K2-GOLD show more like this Calculated in Cart Primary Arms