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Machined specifically for the Windham Weaponry .450 Bushmaster, this Crush Washer is intended to work with the .450 A2 Style Flash Hider and is finished in Black Phosphate. Install with the convex side (bulges outward) towards the receiver, and the concave side
(curves inward) contacting the Flash Hider. It allows proper timing/alignment of the ports on the Flash Hider, and should be replaced every time the flash hider is removed.
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