AR-15 LPK Disconnector

Description

OVERVIEW – PRECISION MIL-SPEC DISCONNECTOR FOR RELIABLE FIRE CONTROL FUNCTION

The AR-15 LPK Disconnector is a critical component of your AR-15 fire control group, responsible for the safe and reliable semi-automatic function of your rifle. If you are missing this small part from your Lower Parts Kit, building a custom trigger group, or replacing a worn disconnector, this mil-spec replacement ensures your rifle functions exactly as designed. The disconnector works in conjunction with your trigger and hammer to catch and hold the hammer rearward after a shot is fired until the trigger is released and reset. Without a properly heat-treated and correctly dimensioned disconnector, your AR-15 can suffer from hammer follow, doubling, or failure to reset — all serious safety and reliability issues.

This disconnector is manufactured to strict mil-spec tolerances from high-carbon steel and is properly heat-treated for hardness and durability. It features the correct geometry for positive engagement with both the hammer and trigger, ensuring a crisp disconnection and a clean, audible and tactile reset. The engagement surfaces are machined smooth to prevent gritty feel and premature wear, while the black oxide finish provides corrosion resistance and lubricity. It is compatible with all standard AR-15, M4, and M16 lower receivers and fire control groups, including forged, billet, and 80% lowers. Whether you are completing a lower build, performing maintenance, or keeping spare parts on hand for your workbench, this disconnector is a must-have small part that restores factory function and safety to your rifle. It works with both standard mil-spec triggers and most enhanced and polished trigger groups that use mil-spec disconnector dimensions.

WHY CHOOSE THIS AR-15 LPK DISCONNECTOR

Small part, major function — get reliable semi-auto operation back.

1. Mil-Spec Dimensions for Positive Hammer Engagement and Safe Function: The disconnector is one of the most safety-critical parts in the AR-15 fire control system. Its job is to catch the hammer after the rifle cycles and hold it until you release the trigger, at which point the trigger sear re-engages the hammer for the next shot. If the disconnector is out of spec, too soft, or has improper geometry, you can experience hammer follow where the hammer rides the bolt forward, doubling, or a trigger that fails to reset. This disconnector is cut to exact mil-spec print dimensions, ensuring the disconnector hook properly captures the hammer spur and the disconnector tail properly times with the trigger. The pin hole is precision reamed for a smooth fit on the trigger pin without binding or excessive play. This ensures consistent timing and reliable reset shot after shot, whether you are shooting slow fire on the bench or rapid strings in competition.

2. Heat-Treated High-Carbon Steel with Corrosion-Resistant Finish: Durability is critical for a part that sees impact and friction every shot. This disconnector is made from high-carbon steel and is through-hardened and then tempered to the correct hardness range to resist wear, peening, and deformation of the critical hook and engagement surfaces. The surfaces will not round off or mushroom after thousands of cycles like soft, unheat-treated copy parts can. The black oxide finish adds a layer of corrosion protection and reduces friction, helping the disconnector move smoothly within the trigger slot. The finish also holds light oil, keeping the part lubricated during extended shooting sessions. This is not a cheap cast MIM part that is brittle — it is built to mil-spec material and hardness standards for long service life in duty, defense, and high-round-count training rifles. Proper heat treatment also ensures the disconnector spring pocket and tail maintain their shape and function.

3. Drop-In Replacement for Any Standard AR-15 LPK and Fire Control Build: Installation is simple and requires no fitting or gunsmithing. The disconnector drops into the slot in the top of your trigger, with the disconnector spring (small end down) placed between the trigger and disconnector, and is secured by the trigger pin that passes through the trigger and disconnector together. It is compatible with all standard AR-15 lower parts kits, fire control groups, and lower receivers — including AR-15, M4, M16, and AR-10 platforms that use AR-15 style triggers. It works with standard mil-spec triggers, enhanced polished triggers, and most aftermarket triggers that accept mil-spec geometry disconnectors. Ideal as a replacement for a lost LPK part, as a spare for your range bag or armorer’s kit, or as part of a complete custom fire control group build. If you lost your disconnector during a lower build or need to restore a rifle to safe, reliable function, this is the exact spec part you need.

RESTORE SAFE, RELIABLE SEMI-AUTO FUNCTION

The AR-15 LPK Disconnector ensures proper hammer catch, timing, and reset for safe and dependable AR-15 operation.

SPECIFICATIONS

Type: AR-15 LPK Disconnector / Fire Control Group Part. Material: High-Carbon Steel. Hardness: Mil-Spec Heat Treated. Finish: Black Oxide. Function: Semi-Auto Disconnector for Hammer Catch and Trigger Reset. Compatibility: All Standard AR-15 / M4 / M16 Lower Receivers and Mil-Spec Fire Control Groups. Pin Size: Standard .154″ Trigger Pin Hole.