The Rock Island Armory Tac Ultra MS is a 1911-style semi-automatic pistol chambered in 10mm Auto with a 4.25-inch barrel and steel frame. The parkerized finish covers both the frame and slide, and the G10 grips in black/gray provide texture for a consistent hold. 
 

Key Specifications 

• Brand: Rock Island Armory 
• Model: Tac Ultra MS 
• Type: 1911 
• Caliber: 10mm Auto 
• Barrel Length: 4.25 inches 
• Capacity: 8 + 1 rounds 
• Weight: 37.70 oz (2.4 lbs) 
• Frame Material: Steel with Black Parkerized finish 
• Slide Material: Serrated Black Parkerized Steel 
• Grips: Black / Gray G10 
• Overall Length (OAL): 8 inches 
• Safety Feature: Beavertail safety 
   

Detailed Features 

 
The beavertail grip safety allows a high grip without the web of the hand making contact with the hammer, which reduces discomfort during extended shooting sessions and positions the hand higher for better recoil management. 
 
The button-rifled barrel is matched to the 1911 frame geometry with standard tolerances. The dovetail front sight and adjustable rear sight are a useful combination for dialing in point of impact, which matters more with 10mm ammunition that can vary in velocity across load types. 
 
At 37.70 oz, the steel frame is heavier than an aluminum or polymer 1911 alternative, which absorbs some of the 10mm's recoil. The G10 grips are a practical texture choice for wet-hand control. 
 

Usage Scenarios 

• Home Defense: The 10mm Auto offers more energy at the muzzle than most service pistol calibers, which suits this role. 
• Shooting Sports: The 1911 trigger and adjustable sights make it competitive at IDPA and similar disciplines. 
• Outdoor/Field Carry: 10mm is appropriate for areas with large wildlife threats where a heavier-hitting handgun makes sense.

The Rock Island Tac Ultra MS in 10mm with a 4.25-inch barrel gets solid marks in most user discussions, particularly for its value relative to other 10mm 1911 options on the market. The combination of steel frame and 10mm caliber is frequently mentioned: the weight absorbs recoil noticeably, and most shooters find strings of 10mm rounds manageable in a way they wouldn't be in a lighter gun.

Accuracy feedback is consistently positive. The adjustable rear sight gets specific praise for allowing shooters to match point of impact to their preferred 10mm load, which can shift meaningfully between lighter and heavier projectiles at different velocities.

The beavertail safety and G10 grips are appreciated for grip control, especially during rapid fire or in warm conditions where hands tend to sweat.

The main criticisms are finish wear and weight. Parkerizing holds up reasonably well to humidity but shows holster wear faster than more modern coatings. The 37.70 oz weight is comfortable at the range but heavier than most people want for all-day carry. A few owners report needing a break-in period with certain 10mm loads before the action cycles reliably, which is common for 1911 platforms. Overall, the Tac Ultra MS is well regarded as a 10mm 1911 that doesn't require a premium budget.