Building Perfect Sig Chassis

Published on March 9, 2026
Duration: 1:04

This video provides a detailed, step-by-step guide on how to build a Sig P365 X Macro chassis system, incorporating the Radian Afterburner + Ramjet barrel and compensator. The instruction, delivered with clear expertise, covers the disassembly of the original slide, installation of the new barrel assembly, and integration with the chassis and a folding stock. The presenter demonstrates efficient techniques for modular firearm upgrades.

Quick Summary

Building a Sig P365 X Macro chassis involves integrating aftermarket parts like the Radian Afterburner + Ramjet barrel and compensator. The process includes disassembling the original slide, installing the new barrel, reassembling the slide onto the FCU within the chassis, and optionally adding accessories like a folding stock.

Chapters

  1. 00:00Build Components Overview
  2. 00:01Unboxing Radian Afterburner Ramjet
  3. 00:04Radian Barrel Compensator Features
  4. 00:11Disassembling Radian Afterburner
  5. 00:20Chassis Assembly: FCU and Slide
  6. 00:27Disassembling P365 Slide
  7. 00:32Radian Barrel vs. P365 Barrel
  8. 00:41Installing Radian Barrel and Slide
  9. 00:49Attaching Chassis Stock
  10. 00:52Final P365 Chassis Build Showcase

Frequently Asked Questions

What are the main components for building a Sig P365 X Macro chassis with aftermarket parts?

The build requires a Sig P365 X Macro FCU and chassis, a Radian Afterburner + Ramjet barrel and compensator assembly, and potentially a folding stock accessory. A hex tool is needed for disassembly.

How do you install the Radian Afterburner barrel onto a Sig P365 slide?

First, disassemble the original Sig P365 slide. Then, install the Radian Afterburner barrel into the slide, ensuring it's properly seated. Finally, reassemble the slide with the new barrel.

What is the purpose of the Radian Ramjet compensator?

The Radian Ramjet is an integrated compensator designed to work with the Afterburner barrel. It aims to reduce muzzle rise and felt recoil by redirecting propellant gases upwards.

Can a folding stock be added to a Sig P365 chassis system?

Yes, this video demonstrates attaching a folding stock accessory to the rear of the Sig P365 chassis system, transforming it into a more stable platform.

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