The Rock Island Armory (RIA) M1911 A1-CS (Compact Size) is a modern, highly popular tribute to the classic military sidearm, scaled down into a short-barreled concealable package. While the gun looks like a vintage military piece, its corporate history actually connects standard American ordnance blueprints with specialized manufacturing in the Philippines. The Colt Officer's ACP Influence: In the mid-1970s and 1980s, requests for a more concealable .45 ACP led to the creation of short-framed 1911 variants, culminating in the Colt Officer's Model. The Rock Island "CS" platform adopts this specific footprint, utilizing a shortened frame (holding 6 or 7 rounds depending on the caliber) and a compact 3.5-inch barrel paired with a truncated slide. This firearm comes with 2-7 round magazines