Tech Tip: Installing the BCM M13 Raider Handguard

Caleb from Brownells walks through the step-by-step installation of the BCM M13 Raider handguard, one of the most lightweight yet rigid handguards available. With a double-walled extrusion design, this handguard offers maximum strength while remaining lightweight, making it an excellent choice for AR-15 builds. Whether you're upgrading your existing rifle or starting a new build, this guide will help you install the BCM M13 Raider handguard correctly.

What You Will Learn 

This video serves as an educational resource for individuals looking to install the BCM M13 Raider Handguard on their AR-15. It breaks down the process into clear, actionable steps, making it accessible for both novice and experienced gunsmiths.

Benefit

By Watching this video, viewers will gain a comprehensive learning experience, enabling hem to install the BCM M13 Raider Handguard effectively. 

Introduction

The BCM M13 Raider is a high-quality M-LOK handguard designed for shooters looking for durability and rigidity without adding unnecessary weight. At less than 12 ounces, this handguard is surprisingly lightweight while maintaining a beefy structure, thanks to its unique hollowed-out internal design.

BCM handguards are known for their 12 o’clock mounting system, which enhances stability and eliminates flex. If you’ve never installed a BCM handguard before, this guide will take you through the process step by step.

Overview of the BCM M13 Raider Handguard

• Material – Made from a double-walled extrusion, allowing it to remain lightweight while increasing rigidity.

• Weight – Less than 12 ounces, making it one of the lightest handguards in its category.

• Mounting system – BCM’s 12 o’clock mounting system ensures zero flex and rock-solid attachment.

• M-LOK compatibility – Provides multiple attachment points for accessories while keeping the rail streamlined.

Now, let’s move on to the installation process.

Tools and Materials Needed

Before starting the installation, ensure you have the necessary tools to properly secure the handguard.

Tools Required:

• Upper receiver vise block (for securing the upper during installation)

• Torque wrench (capable of foot-pounds and inch-pounds)

• T15 Torx driver

• Non-marring hammer

• Moly-based grease (such as Brownells Action Lube Plus)

Included Hardware:

• BCM barrel nut

• Handguard mounting screws

• Anti-rotation tab

• Loctite (optional)

Preparing the Upper Receiver and Barrel

1. Secure the upper receiver in a vise block to keep it stable during installation.

2. Apply a light coat of grease to the barrel extension and receiver threads to ensure proper torque and prevent seizing.

3. Insert the barrel into the upper receiver and press it into place. If using a BCM upper, expect a tight thermal fit, which is completely normal.

Installing the Barrel Nut

1. Apply grease to the barrel nut threads to ensure smooth installation.

2. Hand-tighten the barrel nut onto the upper receiver.

3. Use a torque wrench to tighten the barrel nut to 30-35 foot-pounds.

4. Loosen and retighten the barrel nut 3-4 times to allow the threads to settle properly.

5. For the final torque, tighten to 40-50 foot-pounds as recommended by BCM.

BCM requires this multi-step torquing process to marry the barrel nut threads to the receiver threads, ensuring maximum surface contact and strength.

Installing the Gas Block and Gas Tube

Before mounting the handguard, install your gas block and gas tube assembly. This step is not covered in detail in the video but is an essential part of the process.

Mounting the BCM M13 Raider Handguard

1. Slide the handguard over the barrel nut and ensure proper alignment.

2. Insert the anti-rotation tab into the slot at the rear of the handguard. This prevents twisting and movement.

3. Use a non-marring hammer or a soft mallet to gently seat the handguard into place.

4. Check for proper alignment with the upper receiver.

Installing and Torquing the Handguard Screws

1. Insert the first screw into the scalloped recess and partially tighten it.

2. Switch to an inch-pound torque wrench and set it to 30-40 inch-pounds.

3. Adjust the screw’s rotation to align with one of the scallop recesses.

4. Insert the second screw and tighten it fully to 40 inch-pounds.

Properly torquing these screws ensures that the handguard remains secure and stable under recoil.

Final Fitment Check and Securing Components

1. Visually inspect the alignment of the handguard, barrel, and receiver.

2. Check the anti-rotation tab to ensure it is fully seated.

3. Confirm that the gas block and tube are properly installed and have clearance inside the handguard.

Conclusion

The BCM M13 Raider handguard is one of the most rigid yet lightweight handguards available. Its double-walled extrusion and 12 o’clock mounting system make it an excellent choice for those looking for a rock-solid AR-15 setup.

Key Takeaways:

✔ Lightweight yet rigid design thanks to double-walled extrusion.

✔ Proper torquing is essential for a secure fit.

✔ Anti-rotation tab prevents unwanted movement.

✔ Compatible with all BCM handguards for a consistent installation process.

If you have any questions or comments, let us know below. For more firearm tech tips and gunsmithing guides, visit Brownells and subscribe for more in-depth tutorials.

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