Simply choose the correct size Accu-Washer® shim to accurately index your muzzle brake or flash suppressor while maintaining perfect bore alignment. Since only one shim is required, the tolerance stackups and complexities associated with peel washers and other multi-shim systems are eliminated. This minimizes the risk of baffle strikes, ensuring maximum accuracy and safety from your muzzle brake or suppressor. Includes 18 individually marked Accu-Washer™ shims (timing adjustable from 0-360 degrees in 20-deg increments) and easy to follow instructions. Precision machined from high strength 400 series stainless steel to a guaranteed thickness uniformity of ±0.0001". All shims feature an oxide blasted non-reflective surface finish for low visibility. One Accu-Washer System will align approximately nine brakes (on average) before replenishment shims are needed. Designed to fit 1/2-28 or 5/8-24 threaded barrels.
Note: The Accu-Washer Alignment System can be used with any brand muzzle device.
We recommend these for installing our:
M4-72 Severe-Duty Compensator
M11 Severe-Duty Muzzle Brake
M11-SPR Severe-Duty Muzzle Brake
EFAB (Enhanced Flash Arresting Brake)
AFAB (Advanced Flash Arresting Brake)
FREQUENTLY ASKED QUESTIONS
Crush washers are perfectly acceptable to use on any open aperture muzzle device, such as the standard A2 birdcage flash hider. However, our opinion is they should never be used on any baffle style muzzle device where the clearance hole is only slightly larger than the bullet. Firstly, crush washers come to a knife edge on both mating surfaces - it is likely for this reason that a muzzle device is already misaligned just sitting on the crush washer before it is even torqued down. More importantly, it relies on the principle that the washer will deform uniformly while it is being crushed. This requires that the material is uniform and that you apply a perfectly pure torque load normal to the bore. This is very unlikely (for anyone who has installed one) when you're putting all your might into the 30-60 ft-lbs of torque they often require. The consequence of this misalignment is a baffle strike causing bodily harm at worse and impaired accuracy at best.
On average, each pack will get you about 9 installations before a single replenishment shim is needed. Instead of increasing the price on all muzzle devices to include the Accu-Washer Alignment System, it makes more sense for a user to buy one pack separately and use it across multiple installations.
First, make sure the threads on your barrel and muzzle device are completely clean and free of all debris. Any contamination can limit the rotation. Next, applying a moly-grease or CLP-type lubricant to the threads on the brake and barrel will provide further rotation for the same torque. We suggest you apply generously, then run the brake on and off the barrel a couple times to work it in, then wipe up any excess. The coefficient of friction between the threads is what limits your rotation, cutting this coefficient in half with grease can give you twice as much rotation. You may also apply some lubricant to each side of the shim as there is friction in the works here too. Lastly, a little elbow grease. Since the Accu-Washer shims are used to adjust your brake in discrete intervals, it is inherent that the torque required for proper alignment will fall in a range. The torque load specified in the instructions is merely the minimum required so your device does not rattle free, however you will need to continue to apply torque beyond this to achieve alignment. Higher torque installs may require holding the rifle in a barrel vise.
For full specifications, installation manuals, and more - visit our Technical Resources page:
I used it on my stag tac15 woth the precision armament EFAB muzzle device and I found the exactly right washer for the perfect tight fit. So far it's been a great product.
Had all the washers I needed to time the muzzle brake.
Well worth the price - perfect fit every time for alignment critical brakes
I used these accu-washers to reinstall 2 muzzle devices and it couldn't have been easier. They worked great and the instructions were very easy to follow.
It’s pretty close doesn’t cut with me. Either it’s aligned or it’s not right. I tried multiple times fumbling around with peel washers and they just don’t work. This product is exactly what I was looking for. From now on this will be the only product I use to install and time muzzle devices. Well worth the purchase and could potentially work for several different installations.
The instructions were great and easy to understand. The packaging is ideal for hanging on to shims in the future.
It couldn’t be any easier. look at your muzzle break and guess the angle, use that washer from the instructions and your muzzle break is properly timed.
This is now my go-to system for all muzzle devices: easy to use and effective. Buy a few kits the first time and you're set. My crush washers and shims have been donated. Enjoy