Brownells - AR-15/M16 Gas Piston Conversion Kit Installation

Published on October 21, 2009
Duration: 8:08

This guide details the installation of a CMMG AR-15/M16 gas piston conversion kit, presented by Monty Crain from Brownells. The process involves careful disassembly, modification of the bolt carrier, precise alignment of the new gas block, and securing components with threadlocker. Key steps include verifying the correct operating rod to carrier gap and ensuring smooth operation without binding.

Quick Summary

The installation of a CMMG AR-15/M16 gas piston conversion kit requires careful attention to detail. Key steps include disassembling the bolt carrier, removing the front sight base, installing the new gas block with a 0.034" handguard cap spacer, and ensuring a 0.030"-0.050" gap between the operating rod and bolt carrier. Use Loctite 271 (Red) for securing components.

Chapters

  1. 00:00Tools and Preparation
  2. 00:39Safety and Initial Disassembly
  3. 00:57Bolt Carrier Modification
  4. 02:03Removing the Front Sight Base
  5. 03:16Gas Block Installation
  6. 04:21Alignment and Leveling
  7. 05:31Securing the Gas Block
  8. 06:46Final Assembly and Function Check

Frequently Asked Questions

What are the essential tools for installing an AR-15 gas piston conversion kit?

You'll need hex wrenches, punches, a bench block, a degreaser like Brownells TCE, Loctite 271 (Red), and a level. Proper tools ensure precise installation and function of the CMMG kit.

What is the critical gap measurement for an AR-15 gas piston system?

After installing the CMMG gas piston conversion kit, it's crucial to verify a gap between the operating rod and the bolt carrier. This gap should be between 0.030 and 0.050 inches for optimal performance and to prevent binding.

How is the gas block secured during installation?

The gas block is secured using set screws and cap screws. It's essential to degrease these components and apply Loctite 271 (Red) before tightening them in an X-pattern to ensure even pressure and proper alignment.

What safety precautions must be taken before starting the installation?

Before beginning any work, always ensure the rifle is completely unloaded and clear of ammunition. Separate the upper and lower receivers and remove the charging handle and bolt carrier group to proceed safely.

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