Product Overview and Introduction

Take your AR-15 lower build beyond standard factory grittiness with the ALG Defense Quality Mil-Spec Trigger (QMS) – MPN: 05-198. Designed by the engineering experts at Geissele Automatics, the QMS is built for shooters who want a clean, dependable, duty-grade trigger that strictly adheres to military specifications while eliminating the severe creep and heavy drag of standard stock triggers.

Whether you are building a budget-conscious duty rifle, a reliable home-defense carbine, or an authentic clone, the QMS delivers a smooth, consistent single-stage pull with a positive reset and 100% primer ignition reliability.

Refined Mil-Spec Geometry and Dependability

The QMS takes the standard USGI trigger architecture and refines it through precision machining and stringent quality control:

• Smoother, Cleaner Pull: Expertly machined and hand-finished contact surfaces remove the heavy grit and crunch typical of standard factory fire control groups.

• Mil-Spec Reliability: Retains full-power hammer springs and standard Mil-Spec geometry, guaranteeing positive ignition across all commercial, surplus, and steel-cased ammunition.

• Durable Parkerized Finish: Treated with a tough, corrosion-resistant military-style finish designed to withstand harsh field environments and heavy use.

• Drop-In Compatibility: Drop-in installation for any standard AR-15 or AR-10 lower receiver utilizing .154-inch trigger and hammer pins.

The Benchmark for Mil-Spec Triggers

The ALG Defense QMS is widely recognized as the gold standard for standard-class triggers. It offers the legal safety margins and rock-solid reliability of a traditional military trigger, but with the refined feel and crispness that makes accurate shooting significantly easier.

Key Features and Benefits

• Geissele Quality Control: Precision-crafted to tighter tolerances than standard factory mil-spec parts.

• Crisp Single-Stage Action: Noticeably smoother pull with a clean break and positive reset.

• Full-Power Hammer: Ensures zero light primer strikes with hard military primers.

• Built for Duty: Rugged ordnance steel construction designed for maximum service life.

Specifications

• Product Type: AR-15 Single-Stage Trigger Upgrade

• Manufacturer Part Number (MPN): 05-198

• Platform Compatibility: AR-15 / AR-10 / Mil-Spec Lower Receivers (.154-inch pins)

• Trigger Type: Single-Stage Mil-Spec Combat Trigger

• Finish: Parkerized / Phosphate Finish

• Manufacturer: ALG Defense