Rock Island Rock Ultra FS 1911 | 10mm 5″ | 8rd | 51991

The Rock Island Armory Rock Ultra FS is a full-size M1911-pattern pistol chambered in 10mm with a 5″ button-rifled barrel. It pairs a parkerized steel frame and slide with black/gray G10 tactical grips and an ambidextrous safety for conventional 1911 ergonomics. The pistol ships with an adjustable rear sight and a high-visibility fiber-optic front sight, plus a full-length guide rod and serrated slide for positive control. For a compact red-dot that works well on a 1911 slide and stays under $1000, consider a Trijicon RMR or a Vortex Venom paired with the appropriate mounting plate.

Applications: range practice and outdoor field work such as hunting medium game are practical uses for a full-size 10mm 1911, and the platform also suits precision target sessions where classic 1911 trigger characteristics are preferred.

Product Specifications

• The manufacturer part number is 51991.
• The UPC is 4806015519911.
• The caliber is 10mm Auto.
• The barrel measures 5 inches and is button-rifled with 6 grooves and a 1:16″ twist.
• The action is Semi-Auto in a traditional 1911 configuration.
• The magazine capacity is 8 rounds and the pistol ships with 1 magazine.
• The finish is black parkerized on steel frame and slide components.
• The grips are G10 tactical grips in a black/gray pattern.
• The sights are a fiber-optic front in a dovetail and an adjustable rear (LPA-type referenced).
• The pistol includes a full-length guide rod and a serrated slide.
• The hammer and trigger are skeletonized and the factory trigger pull is listed as 4–6 pounds.
• The safety configuration is ambidextrous and the frame features an extended beavertail grip safety.
• The overall length is listed as 8.74 inches and the unloaded weight is 2.49 lb (approx. 40 oz).
• The barrel description is listed as a 5″ button-rifled barrel and the barrel length range is 5.00″ to 5.99″.
• The pistol is supplied in a plastic case and includes standard factory accessories.

The Rock Ultra FS takes the familiar M1911 platform and adds factory upgrades that help the pistol perform reliably in disciplined range use and in the field. Its parkerized finish and G10 grips give a tactile, durable interface, while the skeletonized controls and adjustable sights allow for user customization and tuning. If you value a robust, hand-fitted full-size 1911 with modern touches, this Rock Island Armory model represents a practical balance of classic ergonomics and purposeful features.