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". FeaturesRetro M16 3-prong Flash HiderClose replica of reinforced 3-prong flash hider used on the M16 from approximately 1963 - 1967For use up to .30 caliberRequires standard AR crush washer for installation (not included)Heat Treated Note: These have no flats just like the originals. Strap wrench or other specialized tool may be required for install.