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Brownells
The Brownells BRN-4 Quad Rail Handguard in 9 inches gives you serious mounting real estate for optics, lights, and accessories on a compact platform. Designed for the BRN-4 and compatible with HK 416, MR556, and MR223 rifles, this quad rail puts four picatinny rails within arm's reach—top, bottom, and both sides—so you can configure your setup exactly how you want it. The 9-inch length is particularly well-suited to carbine builds, making it a natural fit for shorter barrels like the 10.4" configuration without looking overbuilt.
What sets this handguard apart is the engineering: machined-in locking bolt hardware distributes clamping force evenly across the body, which means your zero won't shift and your accessories stay put through thousands of rounds. An indexing tab at the top mates with your BRN-4 upper receiver to prevent unwanted rotation. The matte black finish gives you a purposeful, modular look that breaks up the rifle's profile—and if you're running it on a black upper, you get that classic two-tone contrast that works on the range, in the field, or at the bench.
Whether you're building a compact duty rifle, a training carbine, or an ergonomic home-defense platform, this quad rail gives you the flexibility to attach exactly what you need without excess weight or length. It's the kind of handguard that rewards shooters who know what they want and aren't afraid to accessorize.
| Handguard Length | 9 inches |
| Finish | Matte Black |
| Rail Configuration | Quad Rail (4 Picatinny Rails) |
| Platform Compatibility | Brownells BRN-4, HK 416, MR556, MR223 |
| Attachment Method | Direct to upper receiver with machined locking bolt hardware |
This quad rail attaches directly to any Brownells BRN-4 upper receiver group. It's also compatible with HK 416, MR556, and MR223 platforms. If you're running one of these systems, you're good to go.
The 9-inch model is designed for carbine applications and works especially well with shorter barrel lengths like the 10.4-inch configuration. If you're running a longer barrel or rifle-length system, Brownells also offers an 11-inch version. The 9-inch keeps things compact and handy while still providing plenty of rail space.
No. The machined-in locking bolt hardware distributes clamping force evenly across the handguard body, which ensures consistent mounting pressure and prevents zero shift. The indexing tab at the top also locks the handguard to your upper receiver to prevent rotation.
This is a true quad rail system with four picatinny rails—top, bottom, and both sides. You can mount lights, lasers, grips, backup sights, or any standard picatinny accessory in multiple positions for a completely customized setup.
Brownells
The Brownells BRN-4 Quad Rail Handguard in 9 inches gives you serious mounting real estate for optics, lights, and accessories on a compact platform. Designed for the BRN-4 and compatible with HK 416, MR556, and MR223 rifles, this quad rail puts four picatinny rails within arm's reach—top, bottom, and both sides—so you can configure your setup exactly how you want it. The 9-inch length is particularly well-suited to carbine builds, making it a natural fit for shorter barrels like the 10.4" configuration without looking overbuilt.
What sets this handguard apart is the engineering: machined-in locking bolt hardware distributes clamping force evenly across the body, which means your zero won't shift and your accessories stay put through thousands of rounds. An indexing tab at the top mates with your BRN-4 upper receiver to prevent unwanted rotation. The matte black finish gives you a purposeful, modular look that breaks up the rifle's profile—and if you're running it on a black upper, you get that classic two-tone contrast that works on the range, in the field, or at the bench.
Whether you're building a compact duty rifle, a training carbine, or an ergonomic home-defense platform, this quad rail gives you the flexibility to attach exactly what you need without excess weight or length. It's the kind of handguard that rewards shooters who know what they want and aren't afraid to accessorize.
| Handguard Length | 9 inches |
| Finish | Matte Black |
| Rail Configuration | Quad Rail (4 Picatinny Rails) |
| Platform Compatibility | Brownells BRN-4, HK 416, MR556, MR223 |
| Attachment Method | Direct to upper receiver with machined locking bolt hardware |
This quad rail attaches directly to any Brownells BRN-4 upper receiver group. It's also compatible with HK 416, MR556, and MR223 platforms. If you're running one of these systems, you're good to go.
The 9-inch model is designed for carbine applications and works especially well with shorter barrel lengths like the 10.4-inch configuration. If you're running a longer barrel or rifle-length system, Brownells also offers an 11-inch version. The 9-inch keeps things compact and handy while still providing plenty of rail space.
No. The machined-in locking bolt hardware distributes clamping force evenly across the handguard body, which ensures consistent mounting pressure and prevents zero shift. The indexing tab at the top also locks the handguard to your upper receiver to prevent rotation.
This is a true quad rail system with four picatinny rails—top, bottom, and both sides. You can mount lights, lasers, grips, backup sights, or any standard picatinny accessory in multiple positions for a completely customized setup.
