Replenishment AccuWasher® Gen 2 Shim

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:

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 compatible 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 not interchangeable, allowing the original 5/8” shim to remain available for purchase.

In short:

• ❌ 5/8” original shim ≠ are not 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