Turn your AR15, Into An AR9 ? Yup! 7 Parts, 3 Tools & A Few Bucks And Voila! 9mm PCC Conversion

Published on July 28, 2023
Duration: 6:22

This guide details how to convert an AR-15 lower receiver into a 9mm PCC (Pistol Caliber Carbine) using seven key parts and three essential tools. The process involves installing a specific upper receiver, barrel, bolt carrier group, handguard, and magazine adapter. It emphasizes proper torque specifications and offers troubleshooting tips for ammunition compatibility and buffer weights, drawing on expert knowledge from AT3 Tactical.

Quick Summary

Convert your AR-15 to a 9mm PCC using seven parts and three tools. This cost-effective build requires a 9mm BCG, slick side upper, 16-inch barrel, handguard, flash hider, and magazine adapter. Proper torque values, like 40 ft-lbs for the barrel nut, are crucial for reliability.

Chapters

  1. 00:00AR-15 to AR-9 PCC Conversion Intro
  2. 00:27Speaker Introduction & Cost Savings
  3. 00:49Bolt Hold Open Functionality Considerations
  4. 01:03AT3 Tactical Branded Parts Overview
  5. 01:36Faxon Barrel & Muzzle Device Installation
  6. 02:18Required Tools for Build
  7. 02:49Barrel Installation & Torquing
  8. 03:18Handguard Installation
  9. 04:09Flash Hider Installation
  10. 04:31Magazine Adapter & Installation
  11. 05:05Final Assembly & Function Test
  12. 05:46Troubleshooting & Buffer Weights

Frequently Asked Questions

What are the essential parts needed to convert an AR-15 to a 9mm PCC?

You'll need a 9mm direct blowback BCG, a slick side billet upper receiver, a 9mm barrel (typically 16-inch), a compatible handguard, a 9mm flash hider, a magazine adapter for Glock or Magpul mags, and Aeroshell grease. AT3 Tactical offers a kit with many of these components.

What tools are required for an AR-15 to AR-9 PCC conversion?

Essential tools include a foot-pounds/inch-pounds torque wrench, a muzzle device tool or 3/4-inch wrench, a 5/32 Allen bit, and included Allen wrenches. A barrel nut tool is also necessary, often provided with the upper receiver or handguard.

Can I retain last-round bolt hold open functionality when converting to a 9mm PCC?

The direct blowback 9mm PCC conversion may not retain the last-round bolt hold open functionality that is standard on many AR-15 platforms. This is a consideration for users who rely on this feature.

What is the recommended torque specification for the AR-9 barrel nut?

The barrel nut threads should be greased with Aeroshell grease. After seasoning the threads, the barrel nut should be torqued to 40 ft-lbs. This ensures a secure barrel fit without over-stressing the receiver.

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