Shop for Rock Ultra MS – 45 ACP online at GunBroker.com
The 8+1 capacity Rock Island Armory Rock Ultra MS .45 ACP sits on RIA’s Rock lineup of M1911 semi-automatics based on Series 70 architecture. The MS means Mid-Size. Overall height is 5.5", overall width is 1.4" and overall length is 8". Unloaded weight is 2.5 pounds; this climbs to 2.73 pounds when the gun is loaded.
This semi is a single-stack, single-action, recoil-operated semi-automatic wrapped around a 4.25" length, button-rifled barrel whose 6-grooves spiral inside the bore at an extended 1:15.7” twist ratio.
This pistol conjoins many great details. For instance, it has many tightly packed rear slide serrations. The frame, slide and other exposed parts are strong and hard high-grade SAE 4140 chromium-molybdenum alloy steel. The frame wears a black oxide finish while the slide is Parkerized (anodized for wear and corrosion resistance).
The front sight is a high-contrast red tube fiber optic. In back is an LPA MPS1 type adjustable rear sight that’s cantilevered and ramped, giving you improved usability and a better sight radius for higher accuracy.
The lightweight durable tactical grips are wonderfully wavy and nicely textured in a white to black grayscale G10 polymer.
Otherwise, the gun shares many features with the rest of its Rock siblings. Thus, it gets a nicely upturned beavertail, skeletonized loop hammer, adjustable overtravel stop skeletonized trigger and fixed Parkerized dovetailed sights that are angled for snag-free unholstering.
The trigger is triple ported with stacked trapezoids and has an adjustable overtravel stop. Trigger pull is factory set to 4 to 6 pounds.
Rock Island Armory is a division of Armscor, a contraction of Arms Corporation of the Philippines. The firm started in 1905 in the Philippines, founded by two Englishmen as Squires Bingham & Company. The name changed to Armscor in the 1980s.
That same decade, Armscor debuted operations in the United States and acquired Rock Island Armory, famous for making M1911 semi-automatic pistols, etc. It established its American headquarters at Pahrump, Nevada and later started making ammunition in Stevensville, Montana. Now Armscor enjoys being the world’s largest M1911 producer.
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