The Linemount Retro line is designed to be a faithful reproduction for those that have a longing for the guns of the past, without the sticker shock of a collectible original. Whether you have nostalgia for a weapon of your own youthful days, or you were just born too late, these Retro parts will scratch your itch for the "Good Old Days". FeaturesM16A1 Rear Sight Aperture KitIncludes everything shown in imagePerfect for your retro buildCompatible with A1-style rear sightsWill not fit A2 rear sights