Geissele Automatics Single Stage Precision (SSP) AR-15 Trigger Curved Bow - 05-400

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Geissele Automatics 05400 SSP AR Platform Black Oxide Single-Stage Curved 3-3.75 lbs - 05-400 - 817953021934

Product Description

Precision carbine shooting and speed-focused competition require immediate trigger break dynamics with zero creep. Traditional combat triggers often feature spongey take-up and heavy pull weights, while classic two-stage triggers introduce delay during rapid, high-volume splits. The Geissele Single Stage Precision (SSP) Trigger (05-400) resolves this dilemma by delivering Geissele’s very first true single-stage fire control group, offering instantaneous glass-rod break metrics combined with a lightning-fast reset for AR-15 and AR-10 platforms.

Precision wire-EDM cut from tool steel and finished in a durable black oxide coating, the SSP feature set eliminates all pre-travel take-up. Applying pressure immediately meets a crisp wall that breaks cleanly at 3.0 to 3.75 pounds, depending on the installed spring setup. The classic M4 curved trigger bow geometry offers familiar finger placement, providing consistent tactile reference for high-speed engagement and rapid follow-up shots.

Engineered for hard-use operational service and competition staging, the Geissele SSP utilizes standard MIL-SPEC 0.154" trigger/hammer pin holes. Precision manufacturing guarantees exceptional sear engagement without sacrificing drop-safety or full hammer swing velocity, making the 05-400 an elite single-stage upgrade for marksmen seeking maximum speed and zero-creep crispness.

*Armorer Bench Notes & Real-World Staging Guidance:

Fitment Matrix: Direct drop-in fitment for standard MIL-SPEC lower receivers featuring 0.154" small pin dimensions (AR-15, M4, AR-10, M250/SR25 patterns). Not compatible with Colt large-pin (.169") lower receivers produced prior to 2009.

Installation Sequence:

1. Clear the firearm, remove the magazine, and physically inspect the chamber to ensure an empty weapon.
2. Remove existing fire control group components (pins, hammer, trigger, disconnector).
3. Apply a light drop of gun oil to the pivot pin bores, sear engagement faces, and disconnector notch.
4. Install the SSP trigger assembly into the lower receiver, inserting the trigger pin through the receiver wall.
5. Install the hammer assembly with the hammer spring legs resting correctly on top of the trigger pin, then secure with the hammer pin. Perform a manual function and safety check prior to live fire.

Key Features

• True Single-Stage Precision: Zero pre-travel take-up with an instantaneous, crisp "glass-rod" break.
• Lightweight Pull Weight (3.0 - 3.75 lbs): Optimized balance between match-grade precision and responsive defensive speed.
• Classic M4 Curved Trigger Bow: Ergonomic curved bow provides comfortable finger indexing for rapid follow-up split times.
• Precision Wire-EDM Cut Tool Steel: Manufactured with tight tolerances for long-term sear engagement consistency.
• Standard MIL-SPEC 0.154" Pin Size: Fits all standard small-pin AR-15 and AR-10 lower receivers without custom fitting.

Product Specifications

• Brand: Geissele Automatics
• Model: Single Stage Precision (SSP) Curved Bow
• MPN: 05-400 (05400)
• UPC: 817953021934
• Stage Type: Single-Stage
• Pull Weight: 3.0 lbs - 3.75 lbs
• Bow Profile: Classic M4 Curved
• Pin Size: Standard 0.154" Small Pin
• Platform Compatibility: AR-15 / M4 / AR-10 / M250 / SR25
• Material & Finish: Precision Tool Steel with Black Oxide Finish