RIA 51431 | M1911A1 Rock Standard FS | .45 ACP 5″

The Rock Island Armory M1911A1 Rock Standard FS (MFG #51431) is a full-size, steel-frame 1911 chambered in .45 ACP with a 5″ button-rifled barrel and a parkerized finish. The design follows the 70-series 1911 pattern and includes a full-length guide rod, skeletonized hammer and trigger, and an ambidextrous safety for modern handling. Its factory trigger is specified in the 4–6 lb range, and it ships with an 8-round magazine and a plastic case.

For an optic that pairs well with this platform and stays under $1,000, a compact pistol red dot such as the Trijicon RMR or a comparable micro reflex sight is a suitable choice for sight acquisition without significantly altering holster options.

Product Specifications

• The UPC is 4806015514312.
• The caliber is .45 ACP.
• The magazine capacity is 8 rounds.
• The action is Semi-Auto.
• The barrel measures 5 inches.
• The frame material is Steel.
• The firearm finish is Black parkerized.
• The weight is listed as 40 ounces.
• The sights are described as a low-profile dovetailed front sight and fixed rear sight.
• The pistol includes a full-length guide rod.
• The firearm features a beavertail grip safety and ambidextrous manual safety.
• The barrel rifling is specified as 6 grooves.
• The twist rate is 1:16″.
• The package includes 1 magazine and a plastic pistol case.

The Rock Standard FS is built to the traditional 70-series 1911 dimensions while incorporating user-focused upgrades such as a skeletonized trigger and hammer, beavertail grip safety, and a parkerized finish for corrosion resistance. It is well suited for range work and precision target practice as well as competitive pistol formats that accept full-size 1911s. The controls and weight balance make it familiar to experienced shooters who prefer steel-frame 1911 ergonomics.