RA9-SD DEFCON4-SD 5.75″ Ported Barrel Only (for AR9 platform)

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During checkout, please ensure that you select an FFL (Federal Firearms Licensee) that permits suppressor transfers (SOT). Failure to do so may result in an additional $25 processing fee for us to arrange an eligible FFL on your behalf.
Military and LEO, please contact us to claim your 5% discount.

Ronin Arms offers the DEFCON4-SD 5.75″ ported barrel, specifically designed for the RA9 platform(AR9 platform), providing users with superior suppression capabilities. In this comprehensive guide, we’ll walk you through the installation process, important considerations, and safety precautions for using the DEFCON4-SD barrel. Additionally, we’ll cover Ronin Arms’ warranty information and guidelines for optimal usage.

Installation Process

Before diving into the installation process, it’s crucial to ensure safety and compliance with all legal requirements:.

  1. Read and Understand Instructions: Thoroughly read and comprehend all instructions provided by Ronin Arms before proceeding with the installation.
  2. Check for Defects: Ronin Arms guarantees that the suppressor is free of defects in workmanship and materials. However, it’s essential to inspect the suppressor for any defects or damage upon receipt.

Now, let’s proceed with the installation process:

  1. Ensure Firearm Safety: Before handling the firearm, ensure that it is unloaded and the safety is engaged. Remove the magazine if applicable.

Usage and Safety Precautions

Using the DEFCON4-SD barrel requires adherence to specific safety precautions to prevent accidents and ensure optimal performance:

  1. Never Install or Remove the barrel from a Loaded Firearm: Always ensure that the firearm is unloaded and the safety is engaged before installing or removing the barrel.
  2. Do Not Fire Without the Suppressor: The DEFCON4-SD barrel is designed for use with the suppressor installed. Never fire the firearm without the suppressor attached, as it may cause  catastrophic damage to the barrel and bodily harm.
  3. Follow Legal Requirements: Adhere to all local, state, and federal laws and regulations regarding the use and ownership of suppressors.

Warranty Information

Ronin Arms offers the following warranty for the DEFCON4-SD barrel:

  • The Barrel is guaranteed to be free of defects in workmanship and materials, meeting or exceeding all manufacturing specifications.
  • The warranty covers repair or replacement at Ronin Arms’ discretion for the barrel.


The DEFCON4-SD 5.75″ ported barrel for the RA9 platform by Ronin Arms (AR9 platform) provides firearm enthusiasts with an enhanced shooting experience through superior suppression capabilities. By following the installation process, safety precautions, and warranty guidelines outlined in this guide, users can enjoy the benefits of reduced noise and improved shooting performance with confidence. Remember to always prioritize safety and compliance with legal requirements when using suppressors.

Barrel Length


Suppressor Length



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