AccuWasher® Gen2 Shim Adapter

AccuWasher® Gen2 Shim Adapter

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DESCRIPTION

Utilizing the AccuWasher® Shim Adapters, you gain additional benefits, including:

  • Universal Compatibility: Works with nearly all standard thread diameters and pitches up to ¾”.
  • Metric Compatibility: Supports nearly all metric thread diameters and pitches up to 18mm.
  • Bull Barrel Optimization: Special large-diameter AccuWasher® kits are available in popular thread sizes for bull barrels.
  • Sleek, Aesthetic Finish: Designed for a seamless, professional appearance that standard shims can't achieve.

    • SPECS

      0.825" Adapter 0.925" Adapter
    O.D.: 0.825" 0.925"
    Thread Fitments: 1/2", 9/16",
    M15x1mm    		 1/2", 5/8", 9/16",
    11/16", M15x1mm, M18x1mm
    Thickness: 0.035"
    Full Spec Sheet: View PDF
    Installation Manual: View PDF

    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

    The shim adapter serves three key functions:

    • Expands compatibility - Allows use of the AccuWasher system on multiple thread sizes and barrel profiles that were previously unsupported.
    • Improves fit and finish - Enables shooters to size up to achieve a cleaner visual transition between the muzzle device and barrel shoulder.
    • Adds modularity - Makes the Gen 2 system future-proof and more versatile for both OEMs and end-users.

    Note: If included in your kit, the adapter should be installed before the indexing shim.

    Yes! The new shim adapters are backwards compatible with the original system. This means current Accu-Washer users can upgrade their setup without replacing their entire kit.

    Yes. Shim adapters are available in both 1-pack and 3-pack options and can be purchased separately through our website or authorized dealers.

    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: 585-593-4972

    Email: sales@precisionarmament.com