AR-15 1/2 Inch Crush Washer - Stainless Steel

Stainless Crush Washer

This United Defense crush washer sits between your AR-15 barrel shoulder and the muzzle device. It lets you lock a flash hider or muzzle brake in the exact orientation you want. As you tighten the device, the washer compresses, so it can stop at any point in the rotation instead of wherever the threads happen to bottom out. It suits builders fitting a new barrel and anyone swapping muzzle devices.

Features

• 1/2 Inch Thread Size — Sized for the 1/2-inch muzzle threads found on most .223/5.56 AR-15 barrels, commonly listed as 1/2x28.
• Stainless Steel Construction — Stainless steel resists rust and corrosion at the muzzle, where heat, carbon and moisture collect.
• Crush Design — The washer deforms as you apply torque, which takes up the gap between barrel shoulder and muzzle device.
• Muzzle Device Timing — Timing means indexing the device so its ports or slots face the right way, and the crush washer lets you stop at that position.
• Conical Profile — The beveled, cone-shaped face is what collapses under pressure, as the photo shows.
• Machined Finish — Fine lathe-turned surfaces give a clean, even seat against the barrel shoulder.
• Bare Metal Appearance — The natural stainless finish shows on the barrel as a thin bright band.

Fit And Installation

Slide the washer over the barrel threads with the cone facing the muzzle device, then thread the device on and tighten until it reaches the orientation you want. A crush washer is generally a one-time part: once compressed it will not crush the same way again, so fit a fresh one whenever you remove or reposition a muzzle device. Confirm your barrel's thread size before ordering, because 1/2-inch threads are standard on .223/5.56 AR-15s but other calibers often use different pitches.