Timney Triggers 683 Single-Stage Straight 4.5 lb Trigger for Sig MPX

Timney Triggers Single-Stage Straight Trigger for Sig Sauer MPX (4.5 lbs) - 683 - UPC 081950683000

Product Description

The Timney Triggers Replacement Trigger for the Sig Sauer MPX (Model 683) is a self-contained, drop-in single-stage trigger unit purpose-built to survive and excel under the violent cyclic speeds and heavy blowback forces of the Sig MPX platform. Designed to eliminate the heavy, gritty feel of the factory trigger, the 683 delivers a crisp, zero-creep 4.5 lb pull weight with an instantaneous, tactile reset for rapid follow-up shots.

The Sig MPX platform is notoriously harsh on traditional AR-15 triggers due to its high bolt carrier group velocity and unique recoil impulse. Timney engineered the 683 housing out of lightweight CNC-machined 6061-T6 aluminum, housing internal components heat-treated from premium tool steel to withstand intense high-volume firing schedules. The straight flat trigger shoe profile provides enhanced leverage, consistent finger placement, and perceived lighter pull dynamics.

Factory-tuned with zero gunsmith fitting required, this drop-in cassette installs seamlessly into your standard MPX lower receiver using the rifle's original factory hammer and trigger pins as well as the stock safety selector controls. Backed by Timney's legendary No-Hassle Lifetime Warranty, the 683 trigger transforms your Sig MPX into a competition-ready, high-precision PCC.

*Armorer Bench Notes & Real-World Staging Guidance:

Fitment Matrix: Direct fit for Sig Sauer MPX handguns, short-barreled rifles (SBRs), and carbine models (Gen 1, Gen 2, Copperhead, MPX K, MPX PCC). Note: Reuses original factory MPX trigger/hammer pins and safety selector.

1. Ensure the firearm is completely clear, safe, and unloaded before removing the lower receiver from the upper.
2. Drift out the factory hammer and trigger pins, removing the stock fire control group, disconnector, and springs.
3. Drop the self-contained Timney 683 cassette into the receiver pocket, align with pin holes, push original pins through, and snug down the internal tension set screws to eliminate pin play before function testing.

Key Features

• Factory-Tuned 4.5 lb Single-Stage Pull: Breaks cleanly with zero creep and an exceptionally short, positive reset.
• Flat / Straight Trigger Shoe Geometry: Increases hand leverage and finger contact consistency for target work and rapid splits.
• Heavy-Duty MPX Internal Architecture: Specifically hardened components to withstand extreme MPX bolt velocities and blowback shock.
• Drop-In Self-Contained Cassette: Complete module drops directly into the lower receiver with no fitting or adjustment required.
• Utilizes Factory Pins & Safety: Engineered to integrate directly with original Sig MPX anti-walk/retaining pins and safety selector.

Product Specifications

• Brand: Timney Triggers
• Model: Single-Stage Straight Replacement Trigger for Sig MPX
• MPN / Part Number: 683
• UPC: 081950683000
• Platform Compatibility: Sig Sauer MPX Series (9x19mm)
• Trigger Type: Single-Stage
• Shoe Profile: Straight / Flat
• Pull Weight: 4.50 lbs (Factory Tuned)
• Housing Material: CNC Machined 6061-T6 Aluminum
• Internal Components: Heat-Treated Alloy Tool Steel
• Finish: Anodized Black Housing / Black Shoe
• Mass: ~2.5 oz (70.8 g)