SIG MCX Rattler Barrel Swap & Piston Disassembly

Published on June 1, 2020
Duration: 9:17

This guide details the process of swapping the barrel and disassembling the piston system on a SIG MCX Rattler, as demonstrated by an expert instructor. It covers essential steps from safety checks to reassembly with specific torque values, emphasizing the function of the adjustable gas system for different ammunition types.

Quick Summary

The SIG MCX Rattler barrel is secured by two T27 Torx screws and requires a torque of 60 inch-pounds upon reinstallation. Disassembly involves removing the handguard, loosening these screws, and then addressing the gas regulator and piston system, which features two ports for supersonic and subsonic ammunition respectively.

Chapters

  1. 00:00Introduction
  2. 00:30Safety and Handguard Removal
  3. 01:01Barrel and Piston Overview
  4. 01:31Tools and Barrel Removal
  5. 02:40Piston Disassembly
  6. 04:04Gas Regulator Settings
  7. 04:39Reassembly and Torque Specs
  8. 07:39Final Assembly

Frequently Asked Questions

How do you remove the barrel from a SIG MCX Rattler?

To remove the barrel, first ensure the firearm is clear and the bolt is locked rearward. Remove the handguard by popping the front pivot pin. Then, loosen the two T27 Torx screws retaining the barrel assembly and pull the barrel out of the upper receiver.

What is the correct torque spec for the SIG MCX Rattler barrel?

The factory specification for reinstalling the SIG MCX Rattler barrel is 60 inch-pounds. It's crucial to tighten the screws in the numbered sequence (1 then 2) to this precise torque value for proper function.

Why does the SIG MCX Rattler have a two-position gas regulator?

The two-position gas regulator allows the user to tune the firearm's gas system for different ammunition types. The smaller port is for higher-pressure supersonic rounds, while the larger port is for lower-pressure subsonic rounds, ensuring reliable cycling in both scenarios.

What tools are needed for SIG MCX Rattler barrel and piston disassembly?

For disassembly and reassembly of the SIG MCX Rattler barrel and piston system, you will need a T27 Torx head driver, a mallet, and a punch. A torque wrench is also essential for proper reinstallation of the barrel.

Related News

All News →

More Gunsmithing & DIY Videos You Might Like

More from Arm&Gun

View all →