LBE Unlimited ARCW-5.56 Crush Washer — Black, 5.56×45mm NATO / AR-15 (Model ARCW556 | UPC 765857617459)
Optimize the fit and finish of your muzzle device with the LBE Unlimited ARCW-5.56 Crush Washer — a precision, low-profile solution designed specifically for 5.56×45mm NATO / AR-15 platforms. Whether you’re installing a flash hider, muzzle brake, or compensator, this crush washer gives you repeatable alignment, secure seating, and a professional look with a durable black finish. Small part, big impact — the right washer makes muzzle device timing simple, reliable, and clean.
What it is
A crush washer is a soft, deformable washer placed between the barrel shoulder and threaded muzzle device. The ARCW-5.56 is engineered to compress predictably during final torque, allowing the end user to “time” the muzzle device to the proper orientation (porting, logo, or slots aligned) while maintaining a secure mechanical fit.
Key Features & Benefits
Caliber / Fit: Specifically sized for 5.56×45mm NATO / AR-15 thread interfaces.
Model: ARCW556 — designed to match common muzzle device thread pitches used on AR-platform rifles.
Finish: Durable black coating for corrosion resistance and low glare on duty or competition rifles.
Consistent Crush: Engineered to compress evenly so you can reliably time and align muzzle devices without over-tightening.
Slim Profile: Low overall height minimizes added length and preserves barrel aesthetics.
Reusability (Limited): Intended for one-time use for perfect timing; can often be reused if not overly flattened, but best practice is to replace when removed to ensure consistent timing and clamping force.
Easy Timing: Allows precise orientation (indexing) of flash hiders, brakes, and compensators for cosmetics and functional port alignment.
Works with Common Torque Ranges: Designed to deform predictably within commonly used torque values for muzzle devices on AR-pattern rifles.
Technical Specifications
Manufacturer: LBE Unlimited
Model: ARCW-5.56 (ARCW556)
UPC: 765857617459
Application: 5.56×45mm NATO / AR-15 muzzle device washer
Material: Formulated steel/aluminum alloy (black coated) — engineered to crush predictably under load (material may vary by production run; see packaging).
Color / Finish: Matte Black (corrosion resistant coating)
Outer Diameter: Sized to seat on standard 5.56 muzzle collars (verify against your barrel profile)
Intended Use: Muzzle device timing / orientation and secure seating
Why Proper Timing Matters
Many muzzle devices have asymmetric ports, logos, or aesthetic features that should face a specific direction when installed. A crush washer lets you tighten the muzzle device to the correct rotational orientation without resorting to excessive force or shims. Proper timing:
Ensures ports and compensator cuts are aligned for predictable performance.
Prevents irregular stress on the muzzle threads and muzzle device.
Creates a snug, stable interface for consistent point-of-impact and minimized wobble.
Installation Tips & Best Practices
Confirm thread pitch and compatibility with your barrel and muzzle device before installation.
Hand-start the muzzle device to ensure clean threads, then snug by hand.
Seat the crush washer flat against the barrel shoulder; begin torqueing the muzzle device.
Torque to the muzzle device manufacturer’s recommended spec. Tighten until the washer compresses and the device is timed/positioned correctly.
Replace the crush washer any time the muzzle device is removed for the most consistent timing and clamping force.
Avoid over-torquing — once the washer has crushed and the device is secure, additional torque is unnecessary and can damage threads or the washer.
Compatibility & Use Cases
Perfect for AR-15 builders and owners installing flash hiders, muzzle brakes, and compensators on 5.56/.223 barrels.
Useful for gunsmiths, armorers, competition shooters, and precision builders who need repeatable muzzle device alignment.
Ideal in both duty and sporting builds where low-glare, blacked-out finishes are preferred.
Packaging & Availability
The LBE Unlimited ARCW-5.56 Crush Washer (ARCW556) ships in protective retail packaging labeled with model and UPC for quick identification and inventory. Sold individually or in bulk (check dealer listings) to suit one-off installs or armorer/production needs.
Final Notes
A properly selected crush washer is a small but essential component in any precision AR build. The LBE Unlimited ARCW-5.56 gives you predictable crush characteristics, a clean black finish, and the ability to time your muzzle device quickly and effectively. For repeatable installs and a professional-looking muzzle, this crush washer delivers dependable performance that complements the rest of your rifle build.
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