Description
The B5 Systems Mid-Length Handguard is one of the slimmest drop-in replacements you can put on a mid-length AR-15. It ditches the bulky factory clamshell for a two-piece polymer design that fills your support hand better and gives you a stronger, more natural grip. The slim profile makes a real difference on a rifle you carry all day or run through drills, and the built-in handstop gives your lead hand a consistent index point without having to bolt anything on.
Why the B5 Mid-Length M-LOK Handguard Handles So Well
Six sides of M-LOK slots, 24 in total, mean you can hang lights, a laser, a vertical grip, or a bipod pretty much anywhere you want without messing with offset adapters. The slots run along the top, bottom, and sides, so most accessories bolt right where they need to sit. Because everything mounts directly to the handguard, you can add or move gear without pulling the guard off the rifle.
Built-In Heat Shield on the B5 Systems Handguard
Inside the composite shell sits a stamped metal heat shield that keeps barrel heat away from your support hand during longer strings of fire. That's a nice touch for range days and high-volume shooting where a bare polymer guard would start to warm up. The composite construction keeps the whole thing light and holds up to real-world knocks and weather.
Fitment and Installation
This is a genuine drop-in, so no barrel nut wrenches or gunsmithing required. It works with both round and triangular front handguard caps and fits standard mid-length gas systems. A quick way to check your rifle: measure from the front of the receiver to the back of the front sight block, and if you land around 9 inches, you're running mid-length and this guard is your match. It's a known fit for a range of popular builds including the Springfield Saint and many Palmetto State Armory uppers.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: HMM-1367
- UPC: 814927022362
- Color: Black
- Gas System Length: Mid-Length
- Attachment System: M-LOK
- M-LOK Slots: 6 sides, 24 slots total
- Material: Composite polymer
- Heat Shield: Built-in stamped metal
- Design: Two-piece drop-in
- Handguard Cap Compatibility: Round and triangular
- Country of Origin: Made in USA
What’s Included
- B5 Systems mid-length M-LOK handguard (two-piece)
Frequently Asked Questions
Will this B5 mid-length handguard fit my AR-15?
It's built for standard mid-length gas systems and drops in without a barrel nut swap. To confirm, measure from the front of the receiver to the back of the front sight block; if you're around 9 inches, you're running mid-length and this guard fits. It also works with both round and triangular front handguard caps.
Do I need special tools to install the B5 Systems M-LOK handguard?
No. This is a genuine two-piece drop-in that replaces your factory handguard with no gunsmithing required. You pull the old guard and seat the new one against your delta ring and handguard cap, so it's a quick job for anyone comfortable working on their AR.
How many accessories can I mount on this handguard?
You get six sides of M-LOK slots, 24 in total, running along the top, bottom, and sides. That's plenty of room for a light, laser, vertical grip, or bipod, and the layout usually lets you skip offset mounts. You can add or reposition gear without removing the handguard from the rifle.
Does the polymer handguard get hot during rapid fire?
There's a stamped metal heat shield built into the composite shell that helps keep barrel heat off your support hand. It makes longer strings of fire and range sessions more comfortable than a bare polymer guard would be. The composite body also stays light while holding up to hard use.


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