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Rock Island Armory has been building 1911s longer than most companies have been in business, and the TAC Ultra FS AOS is one of the better examples of what they do well: take a proven platform, add practical upgrades, and keep the price where regular people can actually afford it. This is a full-size M1911 A1-pattern pistol chambered in .45 ACP, wearing a 5-inch button-rifled barrel, all-steel frame and slide, and a black parkerized finish that holds up without any fuss. The frame is built from 4140 ordnance steel and goes through a hand-fitting process before leaving the factory, which shows in how the slide cycles.
The AOS designation stands for Armscor Optic System, and it means the slide comes from the factory with a mounting cut ready to accept a variety of red dot optic plates. This is a big deal on a 1911-platform gun because it means you are not paying a gunsmith to mill your slide later. Pair the optic with the full-length Picatinny rail under the dust cover and you have a platform that can carry a light or laser without any adapter gymnastics. The fixed sights give you a reliable backup reference when running an optic.
The trigger on the TAC Ultra FS is one of its legitimate standout features. Rock Island specs the pull at 4 to 6 pounds with an MR3-style trigger that includes an overtravel adjustment, and a skeletonized, lightweight hammer to go with it. In practice, the single-action break is crisp enough to shoot well without needing immediate gunsmith work. The full-length guide rod keeps the 5-inch barrel cycling smoothly, and the beavertail grip safety and extended ambidextrous thumb safety keep handling safe and ergonomic. The G10 grips are genuinely grippy, which is a good thing on a steel pistol pushing .45 ACP.
Capacity on this model is 8+1 in a standard single-stack configuration, which is exactly what the 1911 faithful expect from this pattern. The parkerized finish is a phosphate coating that resists corrosion and keeps glare off the gun without looking flashy. It is not the prettiest finish in the world, but it is tough and practical. Rock Island backs this pistol with a limited lifetime warranty, which adds some peace of mind for a gun in this price range.
AOS stands for Armscor Optic System. It refers to a factory slide cut that accepts modular optic mounting plates, allowing you to install a variety of red dot sights without custom milling. You will need to purchase the correct AOS plate that matches your specific optic's footprint, such as RMR, Shield RMSc, or Holosun 507C-pattern plates, since they are not always interchangeable.
Rock Island specs the trigger pull between 4 and 6 pounds, and the MR3-style trigger includes an overtravel adjustment screw so you can dial it in a bit. Right out of the box it is a solid single-action break that most 1911 fans will find more than acceptable for range work. It pairs with a skeletonized lightweight hammer that keeps lock time quick.
The TAC Ultra FS has been used in 3-gun and USPSA competition by plenty of people who appreciate the value-to-feature ratio. The full-length Picatinny rail, optic-ready slide, adjustable trigger, and 5-inch button-rifled barrel all point toward a gun that was designed with practical shooting in mind. If you are serious about competition at a higher level you may want to have a gunsmith tune the trigger further, but it is a very capable starting point.
Compatibility depends on which AOS mounting plate you pair with the slide. The system supports a range of popular red dot footprints including Trijicon RMR, Holosun 507C, and Leupold DeltaPoint Pro, among others. The key is matching the correct plate to your specific optic's footprint before purchasing, since the wrong plate will not seat properly.
Yes, this is a single-stack 1911-pattern gun chambered in .45 ACP, so it uses standard GI-spec 1911 .45 ACP magazines. It ships with one 8-round magazine, and it is compatible with a wide variety of aftermarket 1911 magazines from brands like Wilson Combat and Chip McCormick. Quality magazines generally run the most reliably, as is true with any 1911-platform pistol.
Parkerizing is a phosphate-based finish that is well proven in military and law enforcement applications. It is not a flashy finish, but it is durable, corrosion-resistant, and very easy to maintain with a light coat of oil. It will show wear over heavy use but it does its job reliably without peeling or flaking like some spray finishes can.
| UPC | 850071011043 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 57166AOS |
| Sights | Fixed |
| Sights Type | Fixed Sights |
| Product Type | Semi-Auto Pistol |
| Shipping Weight | 0.0 |
| Number of Magazines | 1 8 rd. |
| Action | |
| Barrel Length | 5" |
| Caliber/Gauge | .45 ACP |
| Capacity | 8 + 1 |
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