ROCK ISLAND ARMORY TAC ULTRA FS 45ACP 5in 8+1 AOS
The ROCK ISLAND ARMORY TAC ULTRA FS is built for practical concealed carry-style handling, EDC use, and reliable home-defense readiness with a .45 ACP chambering. This 5-inch 1911-pattern semi-automatic pistol uses an AOS (optic-ready) slide configuration to support modern sighting options while maintaining fixed sight backup capability. Always follow safe firearm handling practices, including verifying the chamber is clear before loading or maintenance.
Designed with a single-action trigger system and a 1-in-16″ rate of twist, the TAC ULTRA FS pairs classic 1911 ergonomics with service-focused durability. It ships with a single 8-round magazine plus an additional chambered round for a total capacity of 8+1.
Key Specifications
- Manufacturer is Armscor/Rock Island Armory.
- Manufacturer Part Number is 57166AOS.
- UPC is 850071011043.
- Caliber is .45 ACP.
- Barrel length is 5 inches.
- Capacity is 8+1.
- Number of magazines included is 1 (8 rd.).
- Action type is Single Action.
- Sights are Fixed Sights.
- Optic compatibility is AOS (optic-ready slide).
- Rate of twist is 1-in-16″.
- Product type is Semi-Auto Pistol.
The TAC ULTRA FS delivers practical performance for everyday carry and defensive use with a duty-length 5-inch barrel, a high-visibility fixed sight setup, and an optic-ready AOS platform for faster target acquisition. With the .45 ACP format and 8+1 capacity, this pistol is built to keep you ready for training, home defense, and range sessions using consistent 1911-style handling.
Frequently Asked Questions (FAQs)
1) Is the ROCK ISLAND ARMORY TAC ULTRA FS AOS pistol optic-ready?
Yes. The “AOS” configuration is designed to accept optics on the slide, supporting modern sighting for training and defensive situations.
2) What is the ammunition capacity of this .45 ACP pistol?
It holds 8 rounds in the magazine plus 1 in the chamber for a total of 8+1.
3) What barrel length does the TAC ULTRA FS use?
This model has a 5-inch barrel.
4) Does it come with only one magazine?
Yes. The product listing indicates 1 (8 rd.) magazine is included.
5) What sights are installed on this pistol?
It uses fixed sights and is also configured with an AOS optic-ready slide for additional aiming options.
6) What type of action and trigger does this handgun use?
It is a single-action semi-automatic pistol.
7) What is the twist rate?
The rate of twist is 1-in-16″.
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