Running an AR-9ish with the ARC Fire! The DD PCC & MP5!

Published on January 6, 2026
Duration: 14:41

This guide details the process of tuning an AR-9 style platform, specifically a Daniel Defense PCC, to reliably function with the ARC Fire trigger system. It covers essential modifications like dremeling the bolt carrier, selecting appropriate buffer and spring combinations, and testing with subsonic ammunition. The expert-level insights highlight the trial-and-error involved in achieving optimal performance on a blowback system.

Quick Summary

Tuning an AR-9 for the ARC Fire trigger involves modifying the bolt carrier by dremeling the rear pocket to prevent lever binding. Experimentation with buffer weights (H3/H4) and recoil springs (Sprinco Red) is crucial for reliability, especially with subsonic ammunition. A VLTOR A5 buffer can function in a carbine tube due to the 9mm system's shorter bolt travel.

Chapters

  1. 00:23Introduction to AR-9 Tuning
  2. 00:56Daniel Defense PCC Overview
  3. 01:30Carrier Modification
  4. 02:22Buffer and Spring Selection
  5. 04:06Live Fire Testing: Subsonics
  6. 06:37MP5 Platform Tuning
  7. 10:41Technical Buffer Comparison

Frequently Asked Questions

What modifications are needed for an AR-9 to run with the ARC Fire trigger?

You may need to dremel out the rear pocket of the bolt carrier on an AR-9 platform to prevent the ARC Fire trigger's lever from binding during operation. This ensures smooth cycling and reliable function.

How does buffer length affect an AR-9 with a carbine buffer tube?

A longer buffer, like the VLTOR A5, can work in a standard carbine buffer tube on a 9mm AR because the 9mm blowback system has shorter bolt travel, compensating for the buffer's increased length.

What are key components for tuning an AR-9's reliability?

Key components include the bolt carrier (for potential modification), buffer weight (e.g., H3, H4), and recoil spring (e.g., Sprinco Red), alongside testing with specific ammunition like subsonics.

What is the purpose of tuning an AR-9 with an ARC Fire trigger?

The goal is to achieve reliable cycling and consistent performance of the AR-9 platform, specifically a Daniel Defense PCC, when using the ARC Fire trigger system, especially with various ammunition types like subsonics.

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