Rock Island Armory M1911-A1 Rock Standard FS 45 Auto (ACP) 5in Gunmetal Gray Cerakote Pistol - 8+1 Rounds - California Compliant - The Rock Standard full-size is built in traditional classic 70 series design and delivered with our top quality production and engineering standards. It's chambered in .45ACP with a 5in button rifled barrel supported by a full length guide rod. Smooth, angled, snag-free style allows for quick draw in fast need situations. Includes a low profile angled rear sight along with skeletonized hammer and trigger with adjustable over travel stop and ambidextrous safety standard in the Rock series.