AR Crush Washers — Timing & Installation Spacers for Muzzle Devices — Universal AR-Platform — UPC 700598349542
Make muzzle device installs clean, secure, and correctly timed with AR Crush Washers (UPC 700598349542). Whether you’re mounting a flash hider, muzzle brake, or compensator, these single-use crush washers provide the axial preload needed to lock your device in place while allowing you to time the ports precisely. Ideal for new builds, barrel swaps, and routine upgrades, they’re an armorer’s must-have for AR-platform rifles and pistols.
Why Use Crush Washers on Your AR Build
Simple timing solution: Easily align the muzzle device’s top port or logo without shims or specialty spacers.
Secure, anti-backout preload: As the washer is compressed during torque, it holds your device in place for long-term reliability.
Clean, professional install: Reduces the chance of gaps or canted devices that can affect performance or aesthetics.
Bench-friendly: No need for precision shim stacks—great for home builders and armorers alike.
Versatile AR compatibility: Commonly used for 5.56/.223 (1/2x28) and .30-cal/7.62 (5/8x24) threaded barrels.*
*Always confirm your thread pitch and washer inside diameter (ID) match the barrel/muzzle device. Using the wrong size can damage threads or impair alignment.
Key Details (At a Glance)
Product Type: AR Crush Washers (single-use timing spacers)
Application: Timing and securing flash hiders, muzzle brakes, comps, and other threaded muzzle devices
Platform: AR-15 / AR-10 / PCC (verify size for your caliber and thread pitch)
Material/Finish: Hardened steel with protective finish (varies by batch)
Orientation: Beveled (cone) side toward the muzzle device; flat side toward the shoulder
UPC: 700598349542
Quantity: Varies by retailer/package—verify listing contents
Installation Overview (Best Practices)
Verify thread pitch & size. Typical AR sizes: 1/2x28 (.223/5.56) and 5/8x24 (.30 cal/7.62).
Prep the threads. Degrease barrel and device; apply a light film of high-temp anti-seize to the muzzle device threads (avoid the bore).
Orient the washer correctly. Flat side to the barrel shoulder; beveled/crush side faces the muzzle device.
Hand-tighten the device against the crush washer.
Torque & time. Using a proper armorer’s wrench, tighten until the device indexes correctly. A common window for many devices is 20–30 ft-lb, then clock to alignment.*
Final check. Confirm a clear bore path with a rod; ensure no washer material intrudes into the bore.
*Follow the muzzle device manufacturer’s torque spec. Do not reuse crush washers; they are designed for single use only.
When to Choose a Crush Washer vs. Shims
Crush Washer: Fast, straightforward installs where small torque adjustments can achieve perfect timing.
Shim Kit: Precision setups (e.g., suppressor mounts) that require exact shoulder-to-shoulder alignment and repeatable removal/reinstallation.
Pro Tip: For suppressor-host rifles, many manufacturers recommend shim kits over crush washers to ensure perfect concentricity with the bore. Always follow the mount manufacturer’s guidance.
Safety & Compliance
Ensure the firearm is unloaded and secured before any work.
Use a quality vise block and barrel/upper support to avoid twisting receivers.
After the first range session, inspect timing and torque; re-check periodically, especially after heat cycles.
Ideal Use Cases
AR-15 general-purpose builds needing a quick, secure flash hider or brake install.
Barrel replacements where timing must be reset.
Training rifles & range carbines that see frequent device changes or maintenance.
What’s in the Package
SEO-Friendly Highlights (Popular Search Terms)
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Time it right. Lock it down. These AR Crush Washers give you the quick, dependable way to time and secure muzzle devices on AR-platform rifles—clean installs, solid alignment, and range-ready reliability.
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