Rock Island 56632 : The TAC series is Rock Island Armory\'s most versatile, all-around 1911 and includes precise engineering elements built with every tactical advantage and choice you could want. All TAC series 1911s include a full-length under-picatinny tactical rail to allow any choice of custom attachment. Skeletonized hammers and triggers with over travel stop provide adjustments important to anyone looking for a fully capable 1911.