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Brownells
The Brownells BRN-4 quad rail handguard in 11 inches is a purpose-built accessory for AR platform rifles that demand modularity and staying power. Designed around the M27 platform, this flat dark earth handguard pairs seamlessly with 16-inch barrel builds on the BRN-4 and compatible HK 416 systems, offering enough rail real estate to mount optics, lights, and other tactical accessories while completely covering the gas block. The FDE finish breaks up the rifle's profile and offers a distinct aesthetic that stands apart from standard black uppers.
What sets this rail apart is the engineering underneath. Brownells machined the locking bolt hardware directly into the handguard body, distributing clamping forces evenly across the entire attachment surface. That means zero shift—your zero stays your zero, shot after shot. An indexing tab at the top mates with the BRN-4 upper receiver to prevent any rotation during use or between range sessions.
Installation is straightforward: the handguard attaches directly to any Brownells BRN-4 upper receiver group. If you're running an HK 416, MR556, or MR223, you're covered too. This is the 11-inch length, ideal for full-size rifle configurations; carbine and shorter-barrel builds should consider the 9-inch option instead.
| Brand | Brownells |
| Product | BRN-4 Quad Rail Handguard |
| Length | 11 inches |
| Color | Flat Dark Earth (FDE) |
| Mounting System | Direct attachment to BRN-4 upper receiver |
| Locking Hardware | Machined-in locking bolts |
| Indexing | Integrated tab prevents rotation |
| Compatibility | BRN-4, HK 416, MR556, MR223 |
This 11-inch model is designed for 16-inch barrel builds on the BRN-4 platform. It covers the gas block and provides ample room for mounting accessories. For shorter carbine barrels (such as 10.4 inches), the 9-inch handguard version is the better choice.
Yes. The Brownells BRN-4 quad rail handguard is compatible with HK 416, MR556, and MR223 platforms in addition to the BRN-4 upper receiver.
The machined locking bolts distribute clamping force evenly across the handguard body, preventing uneven pressure that can cause zero shift. This design ensures your point of impact remains stable between sessions and heavy use.
Yes. An integrated indexing tab at the top of the handguard interfaces with the BRN-4 upper receiver to prevent rotation during mounting and use.
Brownells
The Brownells BRN-4 quad rail handguard in 11 inches is a purpose-built accessory for AR platform rifles that demand modularity and staying power. Designed around the M27 platform, this flat dark earth handguard pairs seamlessly with 16-inch barrel builds on the BRN-4 and compatible HK 416 systems, offering enough rail real estate to mount optics, lights, and other tactical accessories while completely covering the gas block. The FDE finish breaks up the rifle's profile and offers a distinct aesthetic that stands apart from standard black uppers.
What sets this rail apart is the engineering underneath. Brownells machined the locking bolt hardware directly into the handguard body, distributing clamping forces evenly across the entire attachment surface. That means zero shift—your zero stays your zero, shot after shot. An indexing tab at the top mates with the BRN-4 upper receiver to prevent any rotation during use or between range sessions.
Installation is straightforward: the handguard attaches directly to any Brownells BRN-4 upper receiver group. If you're running an HK 416, MR556, or MR223, you're covered too. This is the 11-inch length, ideal for full-size rifle configurations; carbine and shorter-barrel builds should consider the 9-inch option instead.
| Brand | Brownells |
| Product | BRN-4 Quad Rail Handguard |
| Length | 11 inches |
| Color | Flat Dark Earth (FDE) |
| Mounting System | Direct attachment to BRN-4 upper receiver |
| Locking Hardware | Machined-in locking bolts |
| Indexing | Integrated tab prevents rotation |
| Compatibility | BRN-4, HK 416, MR556, MR223 |
This 11-inch model is designed for 16-inch barrel builds on the BRN-4 platform. It covers the gas block and provides ample room for mounting accessories. For shorter carbine barrels (such as 10.4 inches), the 9-inch handguard version is the better choice.
Yes. The Brownells BRN-4 quad rail handguard is compatible with HK 416, MR556, and MR223 platforms in addition to the BRN-4 upper receiver.
The machined locking bolts distribute clamping force evenly across the handguard body, preventing uneven pressure that can cause zero shift. This design ensures your point of impact remains stable between sessions and heavy use.
Yes. An integrated indexing tab at the top of the handguard interfaces with the BRN-4 upper receiver to prevent rotation during mounting and use.
