Forget shims or crush washers, this is how every muzzle device should be mounted. - Precision Armament Accu-Washer Muzzle Device Alignment System

As a machinist I'm very familiar with the use of shims, deformable washers and other precision equipment to ensure alignment and precision when attaching various components.

After using the accu-washers, I'm never going back. The install process is almost mindless it is so easy:

1. Use thickest washer, hand thread on the muzzle device and estimate rotation needed to time correctly.
2. Select appropriate washer based on included chart, clean barrel threads and muzzle device threads
3. Use appropriate washer, apply rocksett to threads and torque on muzzle device.

Perfect alignment every time.