Description
There's a reason the 10mm 1911 pairing keeps winning people over, and the Rock Island Rock Ultra FS is one of the most approachable ways to get into it. This is a traditional 70 series design built from 4140 ordnance steel, CNC machined and hand fitted by Armscor, then wrapped in a no-nonsense black parkerized finish that shrugs off holster wear and field use. The 5 inch button rifled barrel rides on a full length guide rod, and all that steel, right around 40 ounces of it, does a great job taming the snap of full-power 10mm loads. Plenty of folks who expected a handful walk away surprised at how manageable this gun is at the range.
What Sets the Rock Ultra FS Apart
The Rock series is Rock Island's most feature-loaded 1911 line, and it shows. Up front you get a dovetailed fiber optic sight that grabs your eye in any light, matched with an LPA MPS1 style adjustable rear so you can dial in your preferred load, whether that's mild target ammo or stout woods-carry rounds. The skeletonized hammer and trigger with an adjustable overtravel stop deliver a clean 4 to 6 pound factory pull, and the ambidextrous thumb safety keeps things friendly for lefties. Black and gray G10 grips give you real texture that won't slick up when your hands do.
A 10mm That Earns Its Keep
With 8+1 on tap, this pistol makes a strong case as a trail gun, hog hunting sidearm, or backup in bear country, and it's just plain fun for range days. The snag-free profile draws smooth, the sights are quick, and the single action trigger makes it easy to shoot well. For anyone wanting a full-size 10mm 1911 without a custom shop price tag, the Rock Ultra FS delivers where it counts. It ships with one 8 round magazine and takes standard 10mm 1911 mags, so keeping spares on hand is simple.
Key Specifications
- Manufacturer: Armscor / Rock Island Armory
- Model: Rock Ultra FS
- MPN: 51991
- UPC: 4806015519911
- Caliber: 10mm Auto
- Action: Single Action, Series 70 Type Firing System
- Capacity: 8+1 Rounds
- Barrel: 5" Button-Rifled, 1:16 Twist
- Overall Length: 8.75"
- Weight (Unloaded): 40 oz / 2.49 lb
- Frame: 4140 Ordnance Steel, Black Parkerized
- Front Sight: Dovetail Fiber Optic
- Rear Sight: LPA MPS1 Adjustable
- Grips: Black/Gray G10
- Safety: Ambidextrous Thumb Safety, Beavertail Grip Safety
- Trigger Pull: 4 to 6 lb Factory
What’s Included
- Rock Island Rock Ultra FS 10mm pistol
- One 8-round magazine
- Owner's manual
Frequently Asked Questions
How bad is the recoil on the Rock Ultra FS in 10mm?
Less than most people expect. At roughly 40 ounces of all-steel construction, this pistol soaks up a lot of the 10mm's snap, and the single action 1911 platform helps you stay on target. Owners who bought it for woods carry regularly comment on how manageable it feels compared to a magnum revolver.
Is the Rock Ultra FS a good choice for bear country or hunting?
It's a popular pick for exactly that. The 10mm Auto has real authority with heavy hardcast or bonded loads, and 8+1 capacity beats a revolver's cylinder count. The adjustable rear sight lets you zero for whichever heavy load you carry on the trail.
Will the Rock Island Rock Ultra FS work with standard 1911 magazines and parts?
Yes, it uses standard 10mm 1911 pattern magazines, so spares from quality makers are easy to find. Since it's built on a traditional 70 series 1911 design, most common 1911 grips, sights, and small parts are compatible, though as with any 1911, some parts may need minor fitting.
What kind of trigger does the Rock Ultra FS have from the factory?
It ships with a skeletonized trigger with an adjustable overtravel stop and a skeletonized hammer, breaking at a factory 4 to 6 pounds. It's a crisp single action pull that most people find plenty good right out of the box, no gunsmith trip required.





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