Product Overview and Introduction

Bring legendary match-grade performance and duty-proven reliability to your firearm with the Geissele Automatics 2 Stage (G2S) Trigger – MPN: 05-145. Engineered to provide the exceptional feel and precision of Geissele’s flagship SSA trigger at a more accessible price point, the G2S is the ultimate upgrade for shooters who demand a smooth, predictable two-stage pull without compromising safety or durability.

Whether you are building a precision DMR, a dependable duty rifle, or an all-around tactical carbine, the G2S delivers a smooth first-stage take-up followed by a glass-rod second-stage break that dramatically tightens group sizes at distance.

Premium Two-Stage Design and Engineering

The G2S utilizes a specialized design that preserves the safety and robustness of a military-grade trigger while refining the internal geometry for superior performance:

• Smooth Two-Stage Pull: Features a light first-stage take-up (approx. 2.75 lbs) that lets you securely prep the trigger, followed by a crisp second-stage break (approx. 1.75 lbs) for a total pull weight of around 4.5 pounds.

• Full-Power Hammer: Uses a robust, full-weight hammer and reliable hammer spring to ensure positive primer ignition across all commercial, surplus, and military ammunition types without light strikes.

• Constrained Design: Uses a slave pin to hold the hammer and sear during factory assembly, ensuring secure, high-tolerance alignment while maintaining drop-in ease for standard small-pin lower receivers.

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

The Benchmark for Precision Control

The Geissele G2S bridges the gap between heavy factory mil-spec triggers and high-end match triggers. It gives precision shooters the tactile control needed for accurate long-range shots while retaining the safety margins and robust construction required for defensive applications.

Key Features and Benefits

• Geissele Quality: Manufactured to stringent quality control standards using high-grade ordnance steel.

• Controlled Break: Predictable two-stage action helps eliminate anticipation flinch and improves accuracy.

• Positive Reset: Distinct, tactile reset allows for rapid and controlled follow-up shots.

• Universal Compatibility: Drops into any standard AR-15 or AR-10 lower receiver with small (.154-inch) trigger and hammer pins.

Specifications

• Product Type: AR-15 / AR-10 Two-Stage Trigger Upgrade

• Manufacturer Part Number (MPN): 05-145

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

• Trigger Type: Two-Stage Combat / Match Trigger

• Pull Weight: First Stage (~2.75 lbs) + Second Stage (~1.75 lbs) = ~4.5 lbs Total

• Finish: Parkerized / Phosphate

• Manufacturer: Geissele Automatics