Dust Doors on the AR-15 / M16 platform are a barrier between the action and the elements, under constant spring pressure, the action of the bolt carrier reciprocating or being manually cycled the dust door will open up allowing ejection out of the door. During travel, the dust door can be closed and held in place with a captive detent holding it against a groove cut out in the upper receiver.Â
About this Dust Door: The Strike Industries PolyFlex Dust Cover for .223/5.56 offers a simple, quick, and tool-less installation with its one-piece construction. Install in literally seconds by just pushing it into place. With our patent-pending "True Seal" design, the internal lip seals the port tighter than traditional dust covers. Unlike stamped steel dust covers, this PolyFelx DC is made of durable and lightweight polymer which makes it resistant to rust. If the time ever comes, knowing you can remove and quickly reinstall makes this an easy cost-effective choice. Consider the Strike Industries PolyFlex Dust Cover for .223/5.56 for a new build or when you are going to untorque the barrel nut as this is the easiest time to remove your old stamped steel dust cover to upgrade.
Material: Polymer - Made of durable and lightweight polymer
Compatibility:Â Standard Size Upper Receiver Door
COMPATIBILITY:
-AR-15 Mil-Spec upper receivers
-Most billet AR-15 upper receivers
-Aero Precision M4E1
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NOT COMPATIBLE:
-VLTOR MUR: Modular Upper Receiver
-ZRO Delta
-Lantac Enhanced BCG due to the carrier and bolt design
-Bootleg Four Position Adjustable Carrier
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