Description
The B5 Systems Mid-Length M-LOK Handguard is one of the easiest ways to modernize a mid-length AR-15 without tearing into the barrel nut or gas system. It is a two-piece drop-in design meant to replace the standard clamshell handguard your rifle likely came with, so you keep the classic look while gaining real mounting capability. The polymer build keeps things light at around five ounces, and a stamped aluminum heat shield sits inside to help pull heat away from your support hand during longer strings of fire.
What Sets the B5 Mid-Length Handguard Apart
What makes this one worth a look is the balance of slim and functional. The reduced diameter gives you a natural, comfortable wrap that a lot of folks prefer over chunky quad rails, and the integrated handstop gives your support hand a consistent index point so you know exactly where your hand lands every time. It measures roughly nine inches to cover a mid-length gas system, and it plays nice with both round and triangle handguard end caps.
Mounting Gear on the OD Green M-LOK Handguard
You get six sides of M-LOK slots, which opens the door to lights, lasers, vertical or angled grips, hand stops, sling mounts, and bipods. The direct M-LOK interface means you bolt accessories right to the rail without extra adapters cluttering things up. The OD Green finish is a nice change from the usual black and pairs well with FDE or two-tone builds if you are going for that retro-meets-modern vibe.
Fitment for the B5 Systems Mid-Length Handguard
Installation is straightforward and needs no specialty tools for most setups. If you are unsure whether your rifle is set up for a mid-length gas system, measure from the front of the receiver to the back of the front sight block. If that comes out to about nine inches, this handguard is the right fit. It is a proven drop-in on platforms like the Springfield Saint and many Palmetto State Armory uppers, and it is made in the USA.
Key Specifications
- Manufacturer: B5 Systems
- MPN: HMM-1371
- UPC: 814927022409
- Color: OD Green
- Gas System Length: Mid-Length
- Overall Length: Approx. 9 in
- Width: 1.75 in
- Weight: Approx. 5 oz
- Mounting Interface: M-LOK, six sides
- Construction: Polymer with stamped aluminum heat shield
- Design: Two-piece drop-in
- End Cap Compatibility: Round and triangle
- Platform: AR-15
- Origin: Made in USA
What’s Included
- B5 Systems mid-length M-LOK handguard (two-piece, OD Green)
Frequently Asked Questions
Will the B5 mid-length handguard fit my AR-15?
This handguard is built for AR-15 rifles running a mid-length gas system. The easiest way to confirm 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, you are good to go, and it fits common platforms like the Springfield Saint and many PSA uppers.
Do I need special tools to install it?
For most rifles, no specialty tools are required. It is a two-piece drop-in that replaces your standard clamshell handguard, so it works with your existing delta ring and end cap setup. It is compatible with both round and triangle handguard caps.
Can I mount accessories directly to it?
Yes. It has M-LOK slots on all six sides, so you can bolt lights, lasers, grips, sling mounts, hand stops, and bipods straight to the rail. The direct M-LOK interface means no extra rail adapters are needed for M-LOK accessories.
Does the polymer handguard get hot during rapid fire?
There is a stamped aluminum heat shield built inside to help move heat away from your support hand during longer strings. As with any slim handguard, keeping a proper grip below the gas tube area keeps your hand comfortable, and a set of gloves is smart if you are running heavy volume.





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