AR15 Crush Washer for 9MM & 5.56 Barrels

(1 customer review)

1/2″ crush washer for 9MM and 5.56/.223 barrels. Protect your barrel and properly align your muzzle device. Works with 1/2×28 and 1/2×36 barrels.


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1/2″ (0.50″ ID) Crush washer for 9MM barrels and 5.56/.223 barrels. Protect your barrel and properly align your muzzle device with an American made crush washer. Please note: don’t use a crush washer if you are using a suppressor. Instead use suppressor muzzle shims. This will ensure properly alignment of your suppressor.


  • Standard crush washer
  • Phosphate coated
  • Made in USA
  • Will work with 9MM barrels in 1/2×28 and 1/2×36 as well as 5.56/.223 barrels in 1/2×28 thread

Frequently Asked Questions

Yes. Most muzzle brakes need to be correctly timed in order to align the gas ports in the correct orientation. When installing a new brake it most likely won’t align perfectly. A crush washer allows you to exert additional force when installing the brake to align it perfectly, without putting stress on your barrel crown (which will negatively impact accuracy). Crush washers as the name suggests, compress when force is applied. It is better that the crush washer deforms then your barrel.

No! You should never use crush washers when using a suppressor/silencer. Crush washers don’t always compress uniformly when force is applied. This means, your muzzle device could become non-concentric (misaligned) with the barrel. And adding a suppressor could lead to baffle strikes.

When using a suppressor you must use suppressor shims when aligning a muzzle device.

The requirement is 15-20 ft-lbs of torque. Note: this is foot pounds. Do not confuse this with in-lbs (inch pounds)

We don’t recommend Loctite for muzzle installation. A better alternative is Rocksett Engineering adhesive. However, if your muzzle device is properly torqued, you shouldn’t need a thread locker unless you’re installing a suppressor attachment, in which case you should use a peel washer / suppressor shims and thread locker.

No. Most 9mm barrels will either be 1/2×28 or 1/2×36. Both of these thread pitches will use the same crush washer. This crush washer will also work with a 1/2×28 5.56 / .223 Remington AR-15 barrel.

Weight 0.015 lbs
Dimensions 3.2 × 3.1 × .01 in

Primary Weapons Systems


Primary Weapons Systems

1 review for AR15 Crush Washer for 9MM & 5.56 Barrels

  1. Sam (verified owner)

    Does what it’s intended to do.

Only logged in customers who have purchased this product may leave a review.

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9MM Crush Washer for 1/2x28 and 1/2x36 Barrels
AR15 Crush Washer for 9MM & 5.56 Barrels

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