Rock Island Armory 51914: The TAC Ultra FS has a full tactical rail and a 5\" button rifled barrel supported by a full length guide rod and full dust cover. It includes a low profile adjustable rear sight and high visibility fiber optic front sight and is also fitted with a skeletonized hammer and trigger with adjustable over travel stop. The TAC Ultra is finished with a tough parkerzied matte coating and adds battle ready G10 tactical grips.