Installing a Muzzle Device with the AccuWasher Gen 2 System: A Step-by-Step Guide

If you’ve ever installed a muzzle device, you know that proper alignment is critical for both performance and aesthetics. At Precision Armament, we’ve made the process easier and more precise with the AccuWasher Gen 2 Muzzle Device Alignment System. Today, we’re walking through the installation process step by step so you can achieve a perfect fit every time.

Step 1: Firearm Safety First

Removal of bolt from rifle

Before you begin, always prioritize safety. Since this installation involves the muzzle end of your rifle, ensure your firearm is completely unloaded with no ammunition nearby. For added safety, we recommend removing the bolt altogether.

Clean threads using wire brush

Next, take a moment to inspect your barrel threads. Make sure they’re clean and free of debris, carbon buildup, or any obstructions that could interfere with installation. If necessary, use a wire brush to remove debris.

Step 2: Identifying Your Shim

The AccuWasher Gen 2 system includes a variety of shims designed to accommodate different thread pitches. The first step is to identify the thickest shim in the kit. Not all kits contain the same quantity of shims, so be sure to check yours carefully.

 

To make selection easier, each shim is marked with a series of thick and thin dashes:

  • Thick dashes represent a value of five
  • Thin dashes represent a value of one

#21 shim

For example, if you’re looking for a #21 shim, you’ll find a combination of thick and thin dashes that add up to 21.

Step 3: Understanding Shim Orientation

Chamfered side of shim

Once you’ve selected the correct shim, locate the side with an inside diameter chamfer—this side should always face against the barrel shoulder for proper alignment.

AccuWasher Gen 2 Shim Adapter

If your kit includes an adapter, install it before placing the shim. The adapter ensures compatibility with different barrel profiles and thread sizes, making the AccuWasher Gen 2 system more versatile than ever.

Step 4: Using the Timing Chart

To simplify alignment, we've included a new timing chart in the installation manual. This chart can be cut out and used as a reference for lining up your muzzle device correctly.

Pitch Timing Chart

  • Place the chart behind the muzzle device.
  • Rotate the device until it aligns with the appropriate number on the chart.
  • That number corresponds to the shim you’ll need for proper timing.

Step 5: Installing the Shim and Muzzle Device

Now that you’ve identified the correct shim:


  • Remove the muzzle device.
  • Install the shim with the chamfer facing the barrel shoulder.
  • Reinstall the muzzle device by threading it onto the barrel.

Muzzle brake not fully aligned

At this stage, the device won’t be perfectly aligned yet—that final adjustment will come during torquing.

Step 6: Final Torquing and Alignment

Aligned muzzle brake

Using a torque wrench, apply pressure until the muzzle device reaches perfect alignment. In order to protect the finish of the muzzle brake, use a piece of paper between the wrench and the brake.

 

The AccuWasher system allows for precise adjustments, ensuring your muzzle device is positioned exactly where it needs to be—without the hassle of stacking multiple shims or relying on crush washers.

Step 7: Ready for the Range

Once aligned, remove the wrench and timing chart, and you’re good to go! Your muzzle device is now properly timed and secured, optimizing performance while maintaining a sleek, professional look.

 

Why Choose AccuWasher Gen 2?

The AccuWasher Gen 2 system builds on the success of its predecessor, offering:

 

    ✔ More compatibility with new shim adapters

    ✔ Easier selection with clearly marked dashes

    ✔ Improved durability with stainless steel construction

    ✔ A cleaner install without excess shims or over-torquing

 

If you have any questions about installation or want to learn more about how AccuWasher Gen 2 can enhance your firearm’s performance, give us a call at 585-593-4975 or email sales@precisionarmament.com.

 

Now, it’s time to hit the range and enjoy the benefits of precision muzzle device alignment!