CMMG Front Sight Base Assembly — Fits .750" Gas Journal Barrels (Approx. 2" Long) — 55DA338 (UPC 815835012773)

Give your rifle a rock-solid aiming solution with the CMMG Front Sight Base Assembly, engineered for barrels featuring a .750" diameter gas journal (approximately 2 inches long). Whether you’re restoring a classic front sight/gas block profile, building a rugged patrol-style carbine, or wanting dependable co-witness with backup iron sights, this CMMG assembly (Model 55DA338, UPC 815835012773) delivers the durability, alignment, and clean look that shooters expect from a premium component.

Why Choose the CMMG Front Sight Base Assembly

• Correct .750" gas journal fit for broad compatibility with popular AR-15 profile barrels.

• Approximately 2" long journal coverage supports secure, stable installation and alignment.

• Front sight + gas block integration provides a time-tested, low-maintenance aiming system.

• Durable steel construction built to handle heat, recoil, and round-after-round reliability.

• OEM-grade geometry for consistent sight height over bore and repeatable zero.

• CMMG quality trusted by armorers, agencies, and serious enthusiasts.

Purpose-Built Performance

The front sight base remains a favorite for shooters who value mechanical simplicity and always-on reliability. With the gas system and front sight integrated, you get a tough, streamlined unit that resists harsh field conditions and keeps your rifle running. This assembly is designed to deliver a true front sight reference at standard height, enabling absolute or lower-1/3 co-witnessing with the right optic setup and rear sight.

Ideal Use Cases

• Duty and defensive builds where rugged iron sights are mandatory.

• Retro/clone projects seeking the classic fixed front sight look and feel.

• Hunting and field rifles that demand dependable aiming in tough weather.

• Training rifles where iron-sight fundamentals matter.

Compatibility Guidance

• Barrels: AR-15 pattern barrels with a .750" diameter gas journal, approximately 2" long.

• Platforms: Standard AR-15 uppers configured for compatible gas systems.

• Sights/Optics: Works with most A2-style rear sights and typical red dots for co-witness.

Note: Barrel journal length and diameter must match. If your barrel uses a different gas journal size or length, select the corresponding front sight base or gas block solution.

Installation & Setup (High-Level)

• Verify your barrel’s .750" journal diameter and ~2" length before installation.

• Ensure proper gas port alignment and secure attachment per professional standards.

• After assembly, confirm zero at your preferred distance and verify repeatability.

For best results and safety, installation should be performed by a qualified armorer or gunsmith following industry-accepted practices.

Durable Construction, Clean Aesthetics

Built from robust steel, this front sight base takes abuse without losing zero. Its clean, classic profile offers snag-resistant functionality while maintaining a standard sight height suited to a wide range of rear irons and optics. The result is a work-ready solution that looks right and runs right.

Technical Details

• Product: Front Sight Base Assembly

• Position: Front

• Model / SKU: 55DA338

• UPC: 815835012773

• Barrel Fit: .750" diameter gas journal, approx. 2" long

• Material: Steel

• Use Case: Integrated front sight & gas block style assembly

SEO Quick Hits (For Easy Scanning)

• CMMG front sight base assembly for .750" barrels

• Fits gas journals approximately 2 inches long

• Integrated front sight/gas block steel construction

• AR-15 fixed front sight base, Model 55DA338

• UPC 815835012773, co-witness capable

The Bottom Line

For shooters who value reliability, simplicity, and proven sighting, the CMMG Front Sight Base Assembly is an outstanding choice. With a .750" gas journal fit and ~2" length compatibility, it’s a durable, straightforward upgrade or replacement that keeps your rifle on target—season after season.

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