Rock Island Armory 51623 Rock Ultra FS 9mm Luger 5" 10+1 SAO Pistol

The Rock Island Armory 51623 Rock Ultra FS is a full-size 9mm Luger semi-automatic pistol built on the classic M1911-A1 platform. Manufactured by Armscor in the Philippines, this 1911 variant pairs the traditional single-action trigger feel with modern usability upgrades like fiber optic sights, a low-profile beavertail, and textured G10 grip panels.

At the heart of the pistol is a 5" button-rifled barrel supported by a full-length guide rod, giving the Rock Ultra FS an overall length of 8.5" and a heft of 40 oz. The single-action-only (SAO) action runs crisply, and the ambidextrous thumb safety pairs with the beavertail frame to let the shooter's hand ride high on the backstrap for improved recoil management and a more natural pointing grip.

The steel frame wears a durable black parkerized finish that matches the serrated slide, while the Black/Gray G10 grip panels stay positive in the hand even in wet conditions. Target acquisition is handled by a bright fiber optic front sight paired with an adjustable rear sight, making follow-up shots fast whether you are running the pistol on the range or using it for personal protection.

Chambered in 9mm Luger with a 10+1 capacity and shipped with a single magazine, the Rock Ultra FS is geared toward both personal protection and sport shooting. It delivers the familiar 1911 manual of arms with the softer recoil and lower cost-per-round of a 9mm chambering, making it a strong fit as a range-ready full-size 1911 or as a modern take on a duty-oriented sidearm.

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