The Rock Island Armory Rock Ultra FS is a full-size 1911-pattern pistol chambered in 10mm Auto. It has a 5-inch button-rifled barrel, fiber optic front sight with adjustable rear, and an all-steel black parkerized build that weighs 40 oz empty. 
 

Key Specifications 

• Model: Rock Ultra FS 
• Caliber: 10mm Auto 
• Barrel Length: 5 inches 
• Capacity: 8+1 rounds 
• Weight: 40 oz (2.49 lbs) 
• Action Type: Single Action Only (SAO) 
• Frame Material: Steel with Black Parkerized Finish 
• Slide Material: Serrated Black Parkerized Steel 
• Overall Length (OAL): 8.74 inches 
• Sight Configuration: Fiber Optic Front, Adjustable Rear 
• Safety Features: Ambidextrous safety lever 
   

Features 

 
Button-rifled barrel maintains consistent rifling depth, which aids accuracy with hot 10mm loads. Fiber optic front sight picks up quickly in good light; the adjustable rear lets you zero for specific ammunition. At 40 oz the steel frame handles 10mm recoil better than lighter alternatives. Parkerized finish provides solid corrosion resistance for a working gun. G10 grips give a secure grip texture without excessive sharpness. Ambidextrous thumb safety and beavertail grip safety follow standard 1911 configuration.

The Ultra FS draws fans who want a steel 1911 in 10mm without a custom-shop price. The parkerized finish and solid feel in hand get repeated positive mentions. 10mm performance for both self-defense and outdoor carry attracts buyers who want versatility across power levels.

New shooters sometimes underestimate 10mm recoil on a first session, though most adapt quickly. A break-in period is commonly recommended — a few owners report minor fitment roughness that smooths out over the first few hundred rounds. Aftermarket support follows general 1911 patterns for most components. Magazine capacity is the standard 1911 limitation in this caliber. The price-to-features ratio is generally viewed favorably for an entry-level 10mm 1911.