The Rock Ultra CS Lightweight pistol is built in traditional 70 series design with an aluminum frame and delivered with our precise engineering standards and first rate upgrades. This pistol is chambered in 45ACP with 3.62 inches button rifled barrel supported by a full length guide rod. Includes a dovetail fiber optic front sight and LPA MPS1 type adjustable rear sight. Also include skeletonized hammer and trigger with adjustable over travel stop and ambidextrous safety, which comes standard in the Rock series. The Rock Ultra CS-L is finished with a tough parkerized coating and adds a battle ready G10 tactical grips. True to all Rock Island 1911s the Rock Ultra comes with a crisp factory 4 to 6 lb trigger to give you a great experience right out of the box.