The M1911 full-size is built with a 5″ barrel supported by a full-length guide rod. Smooth, angled, snag-free style allows for quick draw in fast need situations. Includes a Fixed Dovetail rear sight along with skeletonized hammer and trigger with adjustable over travel stop and ambidextrous safety. Finished with a tough, parkerized matte coating and comes with G10 grips.

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ROCK ISLAND M1911-A1 STANDARD FS .45 ACP 5” 8+1RDS, BLACK PARKERIZED – MODEL 51511

Introduction – A Timeless Legend Reimagined

The Rock Island M1911-A1 Standard FS .45 ACP is not just a firearm—it’s a living tribute to over a century of proven performance, battlefield reliability, and unmatched shooting heritage. The Model 51511 captures the essence of John Browning’s original 1911 design while incorporating the refined craftsmanship, attention to detail, and modern manufacturing precision of Armscor / Rock Island Armory.

Built with a full-size frame, chambered in the powerful .45 ACP cartridge, and featuring an 8+1 capacity, this M1911 variant is ready for range, home defense, or as a serious collector’s piece. Its black parkerized finish gives it a rugged, matte look that resists wear while delivering that no-nonsense, battle-ready aesthetic.

Whether you’re a first-time 1911 owner or a seasoned aficionado, the Rock Island M1911-A1 FS Standard offers the perfect balance of history, performance, and affordability.

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Key Specifications at a Glance

• Manufacturer: Rock Island Armory (Armscor)

• Model: M1911-A1 FS Standard

• SKU / Part Number: 51511

• Caliber: .45 ACP

• Action: Semi-automatic, Single Action Only (SAO)

• Barrel Length: 5 inches (Full-size)

• Overall Length: Approx. 8.56 inches

• Capacity: 8+1 rounds

• Frame / Slide Material: Steel

• Finish: Black Parkerized

• Sights: Fixed, low-profile

• Grip Material: Checkered wood or polymer (depending on variant)

• Weight (unloaded): Approx. 2.49 lbs

• Magazine Type: Single-stack steel magazine

• Safety Features: Manual thumb safety, grip safety

• Trigger Pull: Approx. 4–6 lbs

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Detailed Features & Benefits

1. Legendary .45 ACP Chambering

The .45 ACP (Automatic Colt Pistol) cartridge has been trusted by military and civilian shooters for over 100 years. Known for its stopping power, it delivers a heavy, subsonic bullet that’s perfect for defensive use and target shooting. In the M1911 platform, it offers smooth recoil impulse and accuracy that shooters appreciate.

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2. Full-Size Frame & 5” Barrel

The FS designation stands for Full Size—meaning this M1911 follows the classic Government model proportions. The 5-inch barrel ensures:

• Long sight radius for improved accuracy.

• Optimal bullet velocity for maximum .45 ACP performance.

• Smooth cycling thanks to the original Browning short-recoil design.

Whether you’re on the range or carrying for home defense, the full-size M1911 is the gold standard for reliability.

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3. Black Parkerized Finish

The parkerized coating gives the pistol:

• Corrosion resistance in harsh environments.

• Non-reflective matte appearance for tactical use.

• Classic military look reminiscent of WWII service pistols.

This finish holds up well under regular use while maintaining the pistol’s vintage appeal.

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4. Classic 1911 Single-Action Trigger

The single-action trigger of the M1911 is famous for:

• Short, crisp break that aids precision shooting.

• Consistent pull weight for predictable performance.

• Fast follow-up shots thanks to minimal reset.

Rock Island Armory’s tuning ensures a smooth, clean pull out of the box.

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5. Traditional 1911 Grip Angle & Ergonomics

The natural grip angle of the M1911:

• Points instinctively for faster sight alignment.

• Fits a wide range of hand sizes comfortably.

• Reduces muzzle flip for better control.

The checkered grip panels provide extra traction, even when hands are sweaty or gloved.

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6. Reliable Steel Frame & Slide

The all-steel construction offers:

• Durability to last decades with proper care.

• Balanced weight for recoil control.

• A solid, no-flex shooting platform for tight groupings.

This pistol is built for high round counts without compromising structural integrity.

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7. Rock-Solid Safety Features

• Grip safety: Ensures the pistol only fires when held correctly.

• Manual thumb safety: Allows the shooter to carry “cocked and locked” confidently.

• Half-cock notch: Adds another layer of mechanical protection.

These safeguards are integral to the 1911’s proven track record for safe handling.

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Performance in the Real World

Accuracy

The Rock Island M1911-A1 FS can consistently produce tight groupings at typical defensive distances (7–15 yards) and beyond. The fixed sights are set for combat accuracy, allowing fast target acquisition without unnecessary bulk.

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Reliability

Thanks to precise manufacturing and quality control, this model feeds standard ball ammo and most hollow points reliably right out of the box. It’s also compatible with a wide range of aftermarket magazines and 1911 parts.

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Recoil & Control

The weight of the steel frame and slide tames the .45 ACP recoil, allowing shooters to maintain sight picture and fire follow-up shots without excessive muzzle rise.

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Ideal Uses

1. Home Defense

The .45 ACP combined with an 8+1 capacity offers serious stopping power in a proven platform.

2. Range Shooting

Its smooth trigger and accuracy make it a joy for recreational target practice and competitive shooting.

3. Historical Collection

With its WWII-inspired parkerized finish and classic design, it’s an affordable way to own a piece of firearms history.

4. Duty or Backup Sidearm

For those in security or law enforcement, the M1911 remains a trusted companion.

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Maintenance & Care

The Rock Island M1911-A1 FS is easy to maintain with basic field stripping. Regular cleaning and lubrication ensure decades of reliable service. The parkerized finish requires light oiling to maintain its protective qualities.

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Why Choose the Rock Island M1911-A1 FS Standard .45 ACP?

• Affordable entry into the 1911 world without sacrificing quality.

• Durable materials and time-tested design.

• Compatible with a huge aftermarket for customization.

• Backed by Armscor’s lifetime warranty.

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Conclusion – A True 1911 Experience Without the Hefty Price Tag

The ROCK ISLAND M1911-A1 STANDARD FS .45 ACP 5” 8+1RDS, BLACK PARKERIZED – 51511 delivers heritage, power, and precision in a package that’s as dependable as it is affordable. Whether you’re defending your home, enjoying a day at the range, or simply admiring a modern take on a historic design, this pistol is ready to impress.ROCK ISLAND M1911-A1ROCK ISLAND M1911-A1ROCK ISLAND M1911-A1ROCK ISLAND M1911-A1ROCK ISLAND M1911-A1

With its classic lines, reliable mechanics, and unbeatable value, it stands as one of the best entry points into the world of .45 ACP 1911s—while still satisfying the needs of experienced shooters.

Own a legend. Experience the Rock Island Armory difference.

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