The B5 Systems M-LOK Rail Cover in coyote brown (brand part no. RCM-1258) is a set of four press-in covers built to close off unused M-LOK slots on your handguard. B5 Systems designed each cover to fill three M-LOK sections at once, giving you a smoother, more comfortable gripping surface while protecting the slots themselves from dirt and debris. The press-in fit means no screws or tools are needed for installation or removal, so you can reconfigure your rail layout as your accessory setup changes. Finished in coyote brown, this pack is built as a genuine AR-15 accessory to match tan and FDE builds.

Key Specifications

• Each cover uses a press-in fit requiring no tools to install or remove.
• Every cover fills three M-LOK sections at once.
• Sold as a 4-pack to cover multiple rail sections in one purchase.
• Finished in coyote brown to match tan and FDE builds.
• Confirmed as a genuine AR-15 accessory compatible with standard M-LOK handguards.
• Weighs approximately 1.5 oz, keeping it lightweight for easy carry.
• Measures approximately 4.6 inches in overall length.

Frequently Asked Questions

Do these require tools to install? No, they use a press-in fit that installs and removes by hand.

How many M-LOK slots does each cover fill? Three sections per cover, with four covers included in the pack.

Buy the B5 Systems M-LOK Rail Cover, Coyote Brown, 3-Section, 4-Pack

Exposed M-LOK slots collect grit and dig into your support hand, and these B5 Systems covers solve both problems with a tool-free press-in fit. Four covers give you enough to finish out a full handguard. Shop more B5 Systems gear or browse our gun accessories selection, and order it from our Lubbock, Texas gun shop for fast, direct-to-you shipping.