![]() Higher torque installs may require holding the rifle in a barrel vise. 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. 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. You may also apply some lubricant to each side of the shim as there is friction in the works here too. 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. 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. 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. Any contamination can limit the rotation. Why aren't these included with my muzzle device?įirst, make sure the threads on your barrel and muzzle device are completely clean and free of all debris. The consequence of this misalignment is a baffle strike causing bodily harm at worse and impaired accuracy at best. 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. This requires that the material is uniform and that you apply a perfectly pure torque load normal to the bore. More importantly, it relies on the principle that the washer will deform uniformly while it is being crushed. 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. 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. Note: The Accu-Washer Alignment System can be used with any brand muzzle device.Ĭrush washers are perfectly acceptable to use on any open aperture muzzle device, such as the standard A2 birdcage flash hider. Designed to fit 1/2-28 or 5/8-24 threaded barrels. One Accu-Washer System will align approximately nine brakes (on average) before replenishment shims are needed. All shims feature an oxide blasted non-reflective surface finish for low visibility. Precision machined from high strength 400 series stainless steel to a guaranteed thickness uniformity of ☐.0001". Includes 18 individually marked Accu-Washer™ shims (timing adjustable from 0-360 degrees in 20-deg increments) and easy to follow instructions. This minimizes the risk of baffle strikes, ensuring maximum accuracy and safety from your muzzle brake or suppressor. Since only one shim is required, the tolerance stackups and complexities associated with peel washers and other multi-shim systems are eliminated. Because It’s Time.Simply choose the correct size Accu-Washer® shim to accurately index your muzzle brake or flash suppressor while maintaining perfect bore alignment. Primary Weapons Systems believes in Strength Through Evolution. It’s simple, but it's an intelligent evolution in mounting muzzle devices. It's a definite improvement on over-torquing crush washers and hoping for the best. Use whatever combination of shims you need to properly align your muzzle device. Each Primary Weapons System Shim Kit comes with (8) size 2 muzzle brake shims, and one each of the large (1) shim and the number 3 shim. For smaller adjustments, the number 3 shim will do the trick. It also works well as a spacer for barrels from manufacturers who don’t use pre-thread relief cuts in their designs. ![]() If you need to hold your device back half a turn, a large shim will do the trick. The muzzle break shims in the PWS Shim Kit are each a precise thickness that will have a specific influence on the timing of your muzzle device. ![]() You can breathe easy when you use PWS’s muzzle brake shims instead of peel washers. Forget everything you feared about applying muzzle devices, let it go. The PWS Muzzle Device Alignment Set is a simple shim kit that allows you to properly align your muzzle device by adding the proper shim or combination of shims to achieve the desired results. It’s the answer to all of the hair pulling associated with mounting and properly timing muzzle devices. Case in point, the Primary Weapons System 1/2x28 Muzzle Device Alignment Set. Sometimes life works that way, the answer doesn’t have to be complicated to be right. There has to be a better way, right? Yes, there is, and it’s a fairly simple answer. Not fun, and even less fun to remove if you change a muzzle device. What we hate is the hassle of timing them and setting the installation with crush and peel washers. We love our muzzle devices, flash hiders, compensators, recoil mitigation of all sorts. Different Shim sizes for perfect timing.
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