Description
Geissele's HK Super Modular Rails are known for their clean, snag-free profile, but that slick design means you need a dedicated section to bolt on your Picatinny accessories. That's exactly what this 3-hole, 7-slot rail is built for. It's a direct-mount piece made specifically for the Geissele HK SMR, so it drops right into the mounting locations along the handguard and gives you a true 1913 Picatinny spec surface to work with.
What the HK SMR 3-Hole Rail Brings to Your Build
Seven slots is a nice amount of length. You get enough room for a weapon light, a vertical or hand-stop grip, a pressure switch mount, or a laser/illuminator without crowding everything together. Because it meets true 1913 Picatinny specs, any standard Pic-mounted accessory you already own is going to clamp right on. It's machined from milspec-anodized aluminum, so it's light, tough, and matches the black finish on the rest of your SMR.
Mounting the 3-Hole 7-Slot Rail
Installation is about as simple as it gets. The rail attaches with screws using a 1/8-inch Allen key, and here's the part that makes the Geissele system so nice to live with: the shear lugs on the back of the rail take the majority of the side loading, not the screws. That means once it's snugged down at the mounting points, it stays put and holds zero for your gear. Geissele even advises against thread locker in most cases, since those lugs are doing the heavy lifting. If you do want to lock it in permanently, the only recommended compound is purple Loctite 222, not the stronger blue or red stuff.
A Popular Pick for HK416 and BRN-4 Setups
Folks running 10.4, 14.5, and other HK416-pattern uppers with Geissele SMR handguards reach for these to mount fore grips and lights, and the feedback is consistently positive on how solid they hold. Ships as a single accessory rail section, so if you want light on one side and a grip up front, grab a couple. It's a small part that quietly makes an SMR a whole lot more useful.
Key Specifications
- Manufacturer: Geissele Automatics
- Manufacturer Part Number: 02-212HKB
- UPC: 817953029633
- Color: Black
- Product Type: Direct Mount
- Slots: 7
- Mounting Holes: 3
- Rail Spec: 1913 Picatinny
- Material: Milspec-Anodized Aluminum
- Compatibility: Geissele HK Super Modular Rail (SMR)
- Install Tool: 1/8" Allen Key
What’s Included
- One HK SMR 3-hole 7-slot Picatinny accessory rail section (black)
Frequently Asked Questions
What does the HK SMR 3-hole 7-slot accessory rail fit?
It's designed specifically for the Geissele HK Super Modular Rail (SMR) family, including the popular HK416-pattern handguards. It mounts directly into the rail's dedicated attachment points, so it's not meant for standard M-LOK or KeyMod handguards. If your build runs a Geissele HK SMR, this is a direct match.
What can I mount on the 7-slot rail?
Since it's a true 1913 Picatinny spec surface, just about any standard Pic-mounted accessory will clamp right on. Seven slots gives you room for a weapon light, a vertical or hand-stop grip, a pressure switch mount, or a laser unit. It's a common go-to for adding lights and fore grips to an SMR setup.
How does the 3-hole accessory rail install?
It attaches with screws using a 1/8-inch Allen key at the SMR's mounting locations. The shear lugs on the back of the rail carry the side loads rather than the screws, so it holds firmly once snugged down. Thread locker generally isn't needed, but if you want a permanent install, only purple Loctite 222 is recommended.
Does this come as one rail or a set?
This is a single accessory rail section. If you want gear on more than one spot, like a light on the side and a grip up front, you'll want to grab more than one. Each section covers a 7-slot run of Picatinny space.



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