The Rock Island Armory Tac Ultra FS HC AOS in 9mm (brand part no. 57172AOS) is a high-capacity 1911 whose slide is cut for the AOS optic plate system. Armscor Rock Island Armory builds it with a 5.05-inch barrel and a 16+1 magazine, and it uses Glock-pattern front and rear sights. An ambidextrous thumb safety, an adjustable trigger and G10 grips with a magwell round out the controls. The manganese phosphate (parkerized) finish keeps the look and the wear resistance of a working pistol.

Key Specifications

• Chambering is 9mm (9×19), the economical cartridge for training and carry.
• Capacity is 16+1, a double-stack count for a 1911-pattern pistol.
• The barrel is 5.05 inches long with a 1:10 twist.
• The slide has an AOS optic plate system cut, so a red dot mounts with the matching plate.
• The pistol has an ambidextrous thumb safety for either hand.
• The sights are Glock-pattern front and rear, a pattern many aftermarket sights follow.
• The trigger is adjustable with a 4 to 6 pound pull.
• The grips are G10, paired with a magwell for faster magazine changes.
• The frame has a Picatinny-style rail for a weapon light or laser.
• The finish is manganese phosphate (parkerized), matte and wear resistant.

Frequently Asked Questions

What does AOS mean on this pistol? AOS refers to the optic plate system cut into the slide. Rock Island lists the slide cut as the AOS optic plate system, which allows a red dot to be mounted.

How many rounds does the 9mm Tac Ultra FS HC hold? Rock Island lists the capacity as 16+1.

Does it have a thumb safety? Yes. It has an ambidextrous thumb safety, as is standard on a 1911-pattern pistol.

Buy the Rock Island Armory Tac Ultra FS HC AOS Pistol, 9mm, 5.05-Inch Barrel, 16+1, Optic Plate System

High capacity, an optic plate cut and a rail make this 9mm 1911 a modern take on the platform without losing the single-action trigger. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more semi-auto handguns while you are here.