The patent pending UDC (Ultimate Dust Cover) is the first quick disconnect ejection port cover featuring an internal lip which provides a better seal against the elements. It is constructed out of a high density polymer material making it more durable and functional than the traditional dust covers. The unique internal detent rod design enables users to attach and detach the cover in 5 to 10 seconds with ease. Features an adjustable detent set screw in order to compensate wear on the receiver and increase or decrease opening power. There are multiple designs to choose from to customize your AR! Package includes: - 1x Dust Cover - 1x Spring - 1x Pin Features: - Patent pending spring-loaded, internal detent rod for easy installation and take-down. - Constructed with light-weight durable polymer material - Will never corrode rust or fade - Will never deform or get bent out of shape - Comes in a variety of designs - Patent pending, True Seal, internal lip that seals the port tighter than traditional dust cover designs. - Built-in adjustable detent set screw to compensate for wear on receiver. Note: for the AR-15/M16/M4 .223/5.56 Note: The SI UDC has been tested and fits on Colt, Sig Sauer, Kel-Tec, PWS, MR, Daniel Defense, Stag Arms, Noveske, LMT, and other Mil Spec Receivers with no issues. Due to the thickness of the Polymer UDC and receiver ejection port hinge specifications (only on certain other than Mil Spec receivers) you may encounter fitting/operating complications. However, the UDC is easily modified due to being polymer. If you happen to encounter this problem a little light sanding on the UDC Shaft will resolve this issue. We also recommend light oil on the hinge points for smooth operation.
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