The Strike Industries Ultimate Dust Cover (brand part no. SI-AR-UDC-E-01-223-BK) is a direct-fit replacement dust cover for AR-15, M4, and M16 platform rifles chambered in .223/5.56. Machined in black polymer, it swaps in for a worn or damaged factory cover and adds a level of fit adjustment factory covers don’t offer. Strike Industries built the Ultimate line around a simple detent set screw that lets you tune the cover to your specific upper instead of living with sloppy factory tolerances. It’s a straightforward upgrade for any AR owner who wants a tighter, more reliable dust cover.

Key Specifications

• Features an adjustable detent set screw that compensates for wear on the receiver as the rifle ages.
• The same set screw lets you dial in opening tension so the cover swings open with the right resistance.
• Compatible with AR-15, M16, and M4 platform rifles chambered in .223/5.56.
• Fits billet upper receivers in addition to standard forged uppers.
• Includes the dust cover, spring, and pin needed for a complete installation.
• Molded from black polymer for a lightweight, corrosion-resistant cover.

Frequently Asked Questions

Will this fit a billet upper? Yes. The Ultimate Dust Cover is built to fit billet uppers as well as standard forged AR-15/M4/M16 uppers.

What’s included in the box? The dust cover ships with the cover itself, the spring, and the mounting pin, so you have everything needed to install it.

What does the set screw actually adjust? It compensates for wear on the receiver rail and lets you tune how much force it takes to open the cover.

Buy the Strike Industries Ultimate Dust Cover

Tighten up a sloppy or worn dust cover with the Strike Industries Ultimate Dust Cover, built for a direct fit on AR-platform rifles. Order it from our Lubbock, Texas gun shop for fast, direct shipping, and browse more gun parts and accessories from the full Strike Industries lineup we carry.