AR-15 Disconnector — Mil-Spec Fire Control Component | Precision Heat-Treated Steel | UPC 859819007461

Restore crisp, reliable trigger function with the AR-15 Disconnector (UPC 859819007461)—a small, critical piece of the mil-spec fire control group that ensures proper hammer retention during cycling and a clean handoff to the sear. Whether you’re refreshing a high-round-count carbine, solving intermittent doubles or light primer strikes, or finishing a quality lower build, this drop-in disconnector delivers repeatable timing, consistent reset, and duty-grade durability.

Why This AR-15 Disconnector

• True mil-spec geometry: Precisely ground engagement surfaces support correct hammer capture and release timing, preventing follow-through and erratic reset.

• Heat-treated tool steel: Built from robust steel and hardened for long service life under high round counts, rapid strings, and heavy training cycles.

• Smooth, consistent reset: Clean handoff back to the trigger sear for a predictable break and positive reset—a must for accuracy and speed.

• Corrosion-resistant finish: Uniform, low-glare coating resists moisture, carbon, and common solvents for easy maintenance.

• Direct replacement: Works with standard AR-15 trigger, hammer, disconnector spring, and trigger pin dimensions inside mil-spec lower receivers.

Ideal For

• Maintenance & repair of rifles with inconsistent reset or hammer follow

• New builds seeking a dependable, mil-spec fire control baseline

• Hard-use carbines that demand repeatable trigger timing in all conditions

• Armorers & ranges standardizing reliable, serviceable FCG parts

Key Features at a Glance

• Platform: AR-15 / M4 pattern lowers (semi-automatic)

• Material: Heat-treated tool steel with protective finish

• Function: Retains hammer during cycling and transfers engagement for a safe, consistent trigger reset

• Compatibility: Mil-spec trigger, hammer, disconnector spring, and .154" trigger pin

• UPC: 859819007461

Compatibility Note: For AR-15 semi-auto fire control groups only. Not for AR-10/.308 or non-mil-spec two-stage/competition triggers that specify proprietary disconnectors.

Installation Overview (Gunsmith Best Practices)

1. Ensure the firearm is unloaded and the lower is separated from the upper.

2. Place the disconnector on the trigger with the disconnector spring seated correctly (coil-wound end into the trigger pocket on most springs).

3. Align & pin: Install the trigger into the receiver and secure with the trigger pin; verify free movement and spring tension.

4. Function check: With the upper removed, perform a proper semi-auto function check to confirm hammer capture and positive reset.

5. Live-fire verify: Confirm safe operation at the range using quality ammunition.

Pro Tip: If you’re chasing reset issues, replace the disconnector spring along with the disconnector, and inspect the hammer/trigger hooks for uneven wear.

Troubleshooting Signs You May Need a New Disconnector

• Inconsistent or no reset after firing

• Hammer follow (unsafe; must be corrected immediately)

• Intermittent doubles in a semi-auto (often timing or worn engagement surfaces)

• Uneven sear wear or peening on the disconnector hook

Maintenance & Care

• Keep engagement points lightly lubricated; avoid heavy grease that traps grit.

• Inspect during routine cleanings for burrs, chips, or peening; replace at first sign of excessive wear.

• Use quality springs and pins to maintain correct geometry and timing.

Specifications

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Small part, big reliability—install this Mil-Spec AR-15 Disconnector for clean reset, safe operation, and long-term durability in your fire control group.
The End