Replenishment AccuWasher® Gen 1 Shim (5/8-24)

Name: Replenishment AccuWasher® Gen 1 Shim (5/8-24)
Brand: Precision Armament
Price: 1.9 USD
Availability: InStock

Precision Armament

$1.90

Current Stock:

Quantity:

Adding to cart… The item has been added

These are individually sold Accu-Washer shims. They are intended only for replacing shims used from the full 18 shim set which you must always purchase first. You WILL NOT be able to index or align your muzzle device by purchasing a single Accu-Washer shim.

You must always purchase the full 18 shim set for first time installations. Please refer to Accu-Washer Muzzle Device Alignment System if you have not purchased the full 18 shim set in the past.

RESOURCES

For full specifications, installation manuals, and more - visit our Technical Resources page:

FREQUENTLY ASKED QUESTIONS

The AccuWasher® Gen 2 is an upgraded version of the Precision Armament original single-shim muzzle device alignment system. It allows for precise, repeatable alignment of muzzle brakes, compensators, and suppressor mounts—eliminating the guesswork and inconsistency of peel washers and crush washers. Gen 2 features new shim sizes, thinner profiles, and adapter compatibility for broader use across different thread sizes and barrel profiles.

The Gen 2 system offers several improvements over the original:

Feature	Gen 1	Gen 2
Shim Sizes	1/2” and 5/8” kits only	Now includes 1/2”, 5/8”, and 3/4” kits
Outside Diameter (OD)	1/2” shim: 0.750”	1/2” shim: 0.725” (smaller for a sleeker fit)
Shim Thickness	5/8” shim: 0.060”-0.100”	5/8” shim: 0.040”-0.080” (thinner for finer adjustment)
Compatibility	Limited to fixed thread sizes	Now compatible with all common thread sizes and barrel profiles via shim adapters
Interchangeability	1/2” shims not compatible	5/8” Gen 1 and Gen 2 shims are interchangeable
Aesthetic	Standard fit	More flush and professional finish with adapters

Each shim is laser-marked with a series of thick and thin dashes:

Thick dashes = 5
Thin Dashes = 1
For example, a shim with 4 thick dashes and 1 thin dash equals shim #21.

Use the included timing chart to determine which shim number aligns your muzzle device properly.

Absolutely. Despite all the added features and compatibility improvements, Gen 2 maintains the single-shim design, which offers better alignment, accuracy, and repeatability compared to systems requiring multiple stacked shims.

The reason the original 5/8” Accu-Washer® replacement shim is still available while the original 1/2” shim has been discontinued comes down to design compatibility between Gen 1 and Gen 2 systems.

Here's the breakdown:

Original vs. Gen 2 - 1/2” Shim:
The outside diameter (OD) of the Gen 2 1/2” shim is 0.025” smaller than that of the original version. This dimensional difference makes the original 1/2” shim incompatible with Gen 2, and since Gen 2 is now the active production version, the original 1/2” shim was phased out.
Original vs. Gen 2 - 5/8” Shim:
The OD of the Gen 2 5/8” shim is identical to the original, even though the thickness range has been slightly reduced (for finer timing control). This means that original and Gen 2 5/8” shims are interchangeable, allowing the original 5/8” shim to remain available for purchase.

In short:

✅ 5/8” original shim = still compatible with Gen 2 → still offered.
❌ 1/2” original shim ≠ compatible with Gen 2 → discontinued.

We've created an easy-to-follow and detailed instruction manual with a printable timing chart. If you have questions, feel free to contact our service team:

Phone: 585-593-4975

Email: sales@precisionarmament.com