LBE Unlimited Low Profile Gas Block — .750" — Black Nitride — 4142 Steel — for AR-15 (Model ARLPGB, UPC: 765857617749)

Enhance your AR-15’s performance and streamline your build with the LBE Unlimited Low Profile Gas Block (ARLPGB). Precision-machined from 4142 steel and finished in black nitride, this gas block is designed to provide reliable gas regulation, superior corrosion resistance, and a sleek, low-profile fit beneath most free-float handguards. Built for modern AR-15 platforms chambered in .223 Remington / 5.56 NATO, this gas block ensures your rifle cycles smoothly and consistently, whether you’re running a duty carbine, competition setup, or precision build.

Premium Materials for Professional Performance

The LBE Unlimited ARLPGB is crafted from 4142 chrome-moly steel, known for its strength, heat resistance, and long service life. The black nitride finish adds an additional layer of hardness and corrosion protection while giving the part a smooth, low-friction surface that resists fouling and wear. This combination of material and finish ensures that your gas block performs flawlessly even under high round counts and extreme conditions.

Key Features & Benefits

• Model: ARLPGB

• UPC: 765857617749

• Platform: AR-15 / M4 / M16 pattern rifles

• Material: 4142 hardened steel — tough and heat-resistant for high-performance use

• Finish: Black nitride — offers superior corrosion resistance, reduced friction, and a matte tactical appearance

• Profile: Low profile — fits neatly under most free-float handguards

• Bore Diameter: .750" — fits barrels with .750” gas journal diameter (standard on most AR-15 barrels)

• Attachment Method: Dual set-screw design for secure fit and repeatable alignment

• Compatibility: Works with carbine, mid-length, and rifle-length gas systems (verify gas tube length separately)

Designed for Reliability & Function

This gas block provides a secure, leak-free interface between your barrel and gas system, maintaining consistent backpressure for smooth cycling and reliable bolt operation. The precision-drilled gas port and tight tolerances ensure minimal gas leakage and optimal efficiency in your AR-15’s direct impingement system.

Its low-profile design allows easy installation under free-float handguards, enabling you to use longer handguards for improved ergonomics and accessory mounting without interfering with the gas system.

Installation & Fitment

• Gas Journal Size: .750" (measure your barrel before purchase to confirm compatibility).

• Mounting Type: Dual set screws (use high-temp thread locker or dimpling for best retention).

• Tools Required: Allen wrench, punch set, torque driver, and armorer’s wrench for handguard removal.

• Installation Tips:

  • Align the gas port on the block precisely over the barrel’s gas port.

  • Verify correct gas tube alignment with the upper receiver and gas key.

  • Secure using the provided set screws and ensure proper torque.

  • For best results, use a dimpled barrel or install a gas block dimple jig to prevent movement under recoil.

  • Confirm rifle function and cycling after live-fire testing.

Note: If you are unfamiliar with gas system installation, seek help from a qualified gunsmith to ensure proper alignment and safe operation.

Why Choose Black Nitride Finish?

The black nitride finish used on the LBE Unlimited ARLPGB offers multiple performance benefits:

• Enhanced Corrosion Resistance: Protects the steel against oxidation, carbon fouling, and environmental wear.

• Improved Lubricity: Reduces carbon adhesion, making cleaning faster and easier.

• Extended Service Life: Hardens the surface to resist wear from heat and friction.

• Matte Tactical Look: Matches the finish of modern AR-15 components for a clean, professional appearance.

Ideal Applications

• Custom AR-15 Builds: Perfect for free-float handguard builds where a low-profile gas block is required.

• Duty & Defense Rifles: Durable construction for extreme reliability in professional applications.

• Competition Guns: Stable gas delivery supports consistent cycling and recoil management.

• Range & Training Rifles: Easy to install, clean, and maintain for long-term dependability.

Maintenance & Care

Keep your gas block clean and functional by regularly inspecting it for carbon buildup, gas leakage, and set screw tension. Clean gas passages with solvent and a small brush during barrel maintenance. Ensure screws remain tight and reapply thread locker as needed after extended use.

Technical Specifications

Why Choose the LBE Unlimited ARLPGB Gas Block?

LBE Unlimited has a reputation for producing high-quality AR components that meet or exceed military specifications. The ARLPGB continues that tradition with a design focused on precision, reliability, and value. Whether you’re replacing a factory gas block or completing a custom build, this part delivers professional-grade performance at an affordable price point.

With its 4142 steel core, black nitride protection, and low-profile configuration, the LBE Unlimited ARLPGB ensures your rifle cycles efficiently, looks great, and stands up to the toughest shooting conditions.

Final Thoughts

The LBE Unlimited Low Profile Gas Block (.750", Black Nitride, 4142 Steel, ARLPGB) is the ultimate upgrade for AR-15 builders who demand strength, precision, and long-term dependability. It’s built to handle high-heat, high-round-count environments while providing a clean, flush fit under modern handguards. If you’re serious about optimizing your rifle’s performance, this is the gas block that gets the job done — every time.

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