Rock Island Rock Ultra MS 1911 | .45 ACP | 51487

The Rock Island Armory Rock Ultra MS is a midsize M1911A1 designed for shooters who want a feature-rich, steel-framed 1911 in .45 ACP. It ships with G10 grips, a parkerized finish, a low-profile adjustable rear sight and a high-visibility fiber-optic front sight. The pistol includes a full-length guide rod, skeletonized hammer and trigger, and an ambidextrous safety for handling flexibility. For a sighting solution under $1,000 that complements this platform, consider a compact pistol reflex such as the Holosun 507C for fast target acquisition.

Product Specifications

• Chambering is .45 ACP.
• Barrel length is listed as 4.25 inches in manufacturer specifications.
• Magazine capacity is listed as 8 rounds in product data listings.
• Frame material is steel.
• Frame finish is black parkerized.
• Grip material is G10 in a black/gray pattern.
• Sight configuration is fiber-optic front and adjustable dovetail rear.
• Action is single action, semi-automatic.
• The pistol includes one magazine in the package.
• Additional features include a skeletonized hammer and trigger and an extended beavertail grip safety.
• Slide description is serrated for positive manipulation.
• Barrel type is button rifled with a 1:16″ twist.
• Overall length is listed as 8.0 inches in product dimensions.
• UPC: 4806015514879.

The Rock Ultra MS brings a long list of factory upgrades to the classic 1911 footprint without changing the core design philosophy. Its steel construction and parkerized finish prioritize durability, while the G10 grips and fiber-optic front sight improve purchase and sighting speed in varied lighting. The pistol’s control layout and full-length guide rod make it well suited to range use and precision target work.

Owners and reviewers commonly cite the pistol’s solid fit-and-finish and the crisp factory trigger as standout attributes.