See how to field strip and clean a Rock Island Armory GI M1911-A1 pistol in this video tutorial. This is a .45 caliber handgun that fires the .45 cal ACP round. First thing's first, make sure your weapon is clear. You don't want a round in there when you take it apart. Then, after that, disassemble it. This firearm video gives clear instructions on how to do this disassembly, so pay attention. Then, clean away. After that, you're probably going to want to put that Rock Island pistol back together, so assemble it, and you're done.