Description
B5 Systems built this mid-length M-LOK handguard for folks who want a real upgrade over the chunky factory clamshell without turning their build into a project. It's a two-piece, drop-in design that replaces your standard mid-length handguard using your existing round or triangle end cap, so you don't need a barrel nut, special tools, or a trip to the gunsmith. The Flat Dark Earth finish pairs up nicely with a wide range of receivers and furniture if you're going for a cohesive earth-tone look.
What Sets the B5 Mid-Length Handguard Apart
The big draw here is the slim profile. It's noticeably trimmer than a lot of the bulky OEM pieces out there, which makes it easier to wrap your hand around and keep control during longer strings. A built-in handstop gives your support hand a natural reference point and helps keep everything indexed the same way shot to shot. Six full sides of M-LOK slots mean you've got room for a light, a vertical grip, a bipod, or whatever else your setup calls for, and you can mount and adjust accessories without pulling the handguard off the rifle.
How the FDE M-LOK Handguard Holds Up
Construction is high-strength composite polymer with a stamped aluminum heat shield built right in. That heat shield does the real work during rapid fire or a hot range day, pulling heat away from your support hand so you can keep running the gun comfortably. B5 is a company that favors function over flash, and this piece reflects that with a no-nonsense build that's held up well for people running budget-friendly and serious rifles alike.
Fitment for the Mid-Length Handguard
This version is cut for mid-length gas systems and drops onto a number of common platforms, including the Springfield Saint and a range of Palmetto State Armory uppers. If you're unsure whether yours will work, measure from the front of the receiver to the back of the front sight block. If that comes out to around nine inches, this handguard is the right fit.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: HMM-1368
- UPC: 814927022379
- Color: Flat Dark Earth
- Attachment System: M-LOK
- Gas System Length: Mid-Length
- Design: Two-piece drop-in
- Construction: High-strength composite polymer
- Heat Shield: Built-in stamped aluminum
- Length: 9 in
- Width: 1.75 in
- Weight: Approx. 5 oz
- M-LOK Slots: Six sides
- Cap Compatibility: Round and triangle handguard caps
- Origin: Made in USA
What’s Included
- B5 Systems mid-length M-LOK handguard (two-piece), FDE
Frequently Asked Questions
Will the B5 mid-length handguard fit my rifle?
It's designed for AR-15s running a mid-length gas system and works with both round and triangle handguard caps. The easiest way to check is to measure from the front of the receiver to the back of the front sight block. If that distance is right around nine inches, this handguard is the correct fit. It drops onto common platforms like the Springfield Saint and many Palmetto State Armory uppers.
Do I need special tools to install this M-LOK handguard?
No. This is a two-piece drop-in design that uses your rifle's existing handguard cap and retainer, so there's no barrel nut to swap or gunsmithing required. Most people can have it on in a few minutes. A little patience helps getting the two halves seated snug, but no specialty tools are needed.
How many accessories can I mount on the FDE handguard?
You get M-LOK slots across all six sides, which leaves plenty of real estate for lights, lasers, a vertical grip, a bipod, or a hand stop. One of the nice perks is you can add or reposition M-LOK accessories without removing the handguard from the rifle. That makes fine-tuning your setup a lot easier.
Does the handguard get hot during rapid fire?
There's a built-in stamped aluminum heat shield inside the handguard specifically to manage that. It helps pull heat away from your support hand during volume shooting or a fast range session. Combined with the polymer construction, it keeps things comfortable to hold when the barrel warms up.





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