Precision Armament 1/2x28 Accu-Washer Muzzle Alignment System

Manufactured by Precision Armament
SKU: A02119
MPN: A02119
Manufactured by Precision Armament
2 Reviews

Out of Stock



Precise timing of your muzzle device has several benefits. For muzzle brakes, it allows you to perfectly orient your brake to match your shooting style. With suppressors and suppressor mounts, a properly aligned muzzle device will drastically reduce the risk of baffle strikes and enhance accuracy and repeatability. The Accu-Washer System from Precision Armament is the fastest and easiest muzzle alignment system on the market. Each washer is precision cut to a guaranteed thickness +/- 0.0001" for incredible accuracy and available in 18 sizes with timing adjustable from 0-360 degrees in 20-degree increments. Cut from 400-series stainless with a durable non-reflective oxide finish.

This is a full set of all 18 1/2x28 Accu-Washers.

  • 1/2 x 28 with .750" outer diameter
  • 18 washers in 20-degree increments
  • 400-series stainless steel
  • Oxide blasted matte grey finish

Precision Armament produces a variety of high end accessories, muzzle devices, and more in their modern CNC manufacturing facility. With their full product line designed around rock solid reliability and enhanced reliability. From precision machining to exotic materials, Precision Armament creates products unmatched in performance and backed by a full lifetime guarantee.
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BrandPrecision Armament
FinishOxide Blasted
MaterialSteel - 400 Stainless
Suppressor MountNon-Mount
Thread Pattern1/2 X 28
TypeShim Kit

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

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Worth every penny

by -

I wanted to swap the birdcage that came with my complete Aero upper (which I also purchased from Primary Arms), and my local armorer wasn't available so he advised me to just do it myself and to scoop up a set of these for easier indexing. PA had the best price (they usually do), and shipped them out to me super fast. I also ordered the actual muzzle brake from them for the swap as well (VG6 Epsilon; also at a steal price and also shipped super fast), and these washers made the process stupid easy. 10 minutes start to finish and I have a badass muzzle brake on my AR.

Great Alternative for Shims

by -

Pretty slick for timing muzzle devices. I've used the PWS and Surefire shims for mounting devices on suppressor hosts and never liked the idea of stacking shims. With these you'll need one washer and drastically reduce opportunities for tolerance stacking. Narrowed it down to handful then chose the correct one when applying the final torque. Will use again.