Sig Sauer 8900696 Tread M400 Two-Stage Flat Trigger Kit - 5 lbs Draw Weight for AR-15, M4, Sig M400, Sig MCX, Sig 516

The Sig Sauer Tread M400 Two-Stage Flat Trigger Kit brings match-grade trigger performance to your AR-15 or Sig platform rifle. Built for shooters who demand a clean, predictable break without the complexity of adjustable triggers, this flat-blade two-stage design delivers a crisp 5 lbs pull weight across a range of modern Sig and AR-pattern platforms—perfect whether you're dialing in at the range, running a precision rifle match, or building a reliable duty gun.

A two-stage trigger rewards trigger control. The first stage takes up slack with minimal resistance; the second stage provides a consistent, predictable break point. That architecture makes follow-up shots faster and grouping tighter than a heavy mil-spec trigger, and the flat blade profile sits naturally in your hand for a repeatable trigger press. At 5 lbs, this kit hits the sweet spot between crisp feel and reliability—light enough for precision shooting, heavy enough to remain safe and legal for most jurisdictions.

Sig's Tread M400 kit is engineered to drop into Sig Sauer M400 rifles, the MCX, and the 516 platform, as well as standard AR-15 and M4 patterns. Installation requires standard gunsmithing tools and familiarity with trigger group removal; if you're not comfortable working on your own rifle, have a qualified armorer handle it. This is a purpose-built component for serious shooters and builders who want to optimize their trigger performance.

Key Features

• Two-stage match-grade trigger design for consistent, clean breaks
• Flat blade profile for natural finger placement and control
• 5 lbs trigger pull weight
• Compatible with AR-15, M4, Sig M400, Sig MCX, and Sig 516 platforms
• Precision-engineered by Sig Sauer for reliability and repeatability

Specifications

Frequently Asked Questions

Which rifles and platforms will this trigger fit?

The Sig Sauer Tread M400 Two-Stage Flat Trigger Kit is compatible with AR-15s, M4s, Sig M400 rifles, the Sig MCX, and the Sig 516 platform.

What's the trigger pull weight?

This kit breaks at 5 lbs draw weight, providing a responsive feel suitable for match shooting and tactical applications while maintaining safe, reliable function.

Is this a two-stage or single-stage trigger?

This is a two-stage trigger design, meaning there's a first stage (takeup) and a second stage (break). Two-stage triggers reward good trigger control and help manage recoil between shots.

Do I need a gunsmith to install this?

Trigger installation requires disassembly of your rifle's trigger group and familiarity with firearms assembly. If you're not experienced with this work, have a qualified armorer perform the installation to ensure safe, correct function.