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. Made from a synthetic polymer, this commercial design saves weight and retains the durability of the original design.
About this Dust Door: The patent pending SI UDC enables users to attach and detach the cover in 5 to 10 seconds with ease (stock dust cover will take more time to remove)! It is constructed of a high-density polymer, making it more durable and functional than the traditional dust covers. The Ultimate Dust Cover features an adjustable detent set screw in order to compensate wear on the receiver and increase or decrease opening power (To adjust detent: use small flathead driver and depress the ball detent and adjust as necessary.). Choose multiple designs to customize your AR!New features of the Ultimate Dust Cover Enhanced Version include the added cut-out window on the rod for easy disassemble. It has been made thinner than the original to be compatible with all AR-15 receivers on the market. At the same time that makes it even lighter, weighing in at only 0.3oz!Additionally, The "True Seal" Lip has been slightly modified to provide an even better seal then ever before! The patent pending UDC-E (Ultimate Dust Cover- Enhanced Version) is the modified version of the original UDC for mil-spec receivers.
Material: Polymer - Using a synthetic polymer, this dust door retains the strength and durability of the original dust doors while saving weight.
Compatibility: Standard Size Upper Receiver Door
Color / Finish: Black
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