Description
Bare M-LOK slots have a way of chewing up your palm and letting rail heat soak straight into your support hand. The B5 Systems M-LOK Rail Cover in Flat Dark Earth takes care of both problems at once. Each panel presses right into the open slots and gives you a soft, ribbed surface with plenty of traction, so your grip stays planted whether your hands are dry, sweaty, or gloved up. You get four covers in the pack, and each one fills three M-LOK sections, which is enough to dress up most handguards front to back.
What Sets the B5 Systems Rail Covers Apart
These are molded from a heat and chemical resistant material that shrugs off the abuse a working rifle sees. After a long range session the rail can get toasty, and the rubber-like panels put a buffer between your hand and that heat. They also add barely any bulk. At 4.6 inches long and about 0.62 inches wide, they keep a slim, low-profile look that fits the streamlined feel most folks are after on a modern build. The Flat Dark Earth finish plays nicely with FDE furniture and blends into just about any tan or multicam setup.
Installing the M-LOK Rail Cover
There is nothing fancy here, and that is the point. Line the cover up with your open M-LOK slots and press it in until it seats flush. No tools, no hardware, no fuss. The fit is snug enough that they stay put through recoil and handling, and if you ever want to pull one to add a light or grip, it comes back out without a fight. They fit most machined rails and polymer handguards, though it never hurts to double check your handguard spacing before ordering.
For anyone building out a rifle and looking for a simple, no-nonsense way to cover exposed slots while sharpening up their grip, this four-pack is an easy call. B5 Systems has a reputation for gear that favors function over flash, and these covers fit that mold perfectly.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: RCM-1257
- UPC: 814927022157
- Model: M-LOK Rail Covers
- Color: Flat Dark Earth
- Mounting System: M-LOK
- Attachment: Press-In Fit
- Coverage Per Cover: 3 M-LOK sections
- Pack Quantity: 4 rail covers
- Length (each): 4.6 in
- Width (each): 0.62 in
- Weight (each): 0.15 oz
- Material: Heat and chemical resistant rubber-like polymer
- Surface: Soft, ribbed non-slip texture
- Product Type: Rail Covers
What’s Included
- 4 B5 Systems M-LOK Rail Covers (Flat Dark Earth)
Frequently Asked Questions
How many M-LOK slots does each rail cover fill?
Each cover fills three standard M-LOK sections. Since this is a four-pack, you have enough coverage to run panels across multiple sides of a typical handguard. That is usually plenty to knock out the exposed slots on a standard build.
Do the B5 Systems rail covers need any tools to install?
No tools required. You just line the cover up with your open M-LOK slots and press it in until it sits flush. The fit is snug enough that it stays put through recoil and handling, and it pulls back out easily if you need to free up a slot later.
Will the M-LOK rail cover help with heat?
Yes. The rubber-like material is heat and chemical resistant, so it puts a buffer between your support hand and a rail that has warmed up during longer strings of fire. It also adds a soft, grippy surface that makes the gun more comfortable to hold in general.
Will these fit my handguard?
The covers are designed to fit most machined rails and polymer handguards with standard M-LOK slots. Some handguards with unusually flat or thick rail profiles can be tighter than others, so it is worth confirming your handguard uses standard M-LOK spacing before you buy.




Reviews
There are no reviews yet.