The TAC Standard full size introduces a full tactical rail. Like all Rock Island 1911s, this series is built with 4140 Ordnance steel and refined by carefully managed hand fitting process. This pistol is chambered in 45 ACP with a 5" button rifled barrel supported by a full length guide rod and full dust cover. Includes a low-profile angled rear sight along with skeletonized hammer and trigger with adjustable over travel stop. The TAC Standard is finished with a tough parkerzied matte coating and has durable polymer checkered grips. True to all Rock Island 1911s, the TAC Standard comes with a crisp, factory 4- to 6-pound trigger to give you a great experience right out of the box.