The Brownells BRN-4 Barrel Nut is a machined HK-style barrel nut designed for BRN-4, HK416, and MR556 builds. It is cut to exact dimensions to work properly with HK-style handguards for a secure, consistent fit during assembly.
Key Features
Machined to exact dimensions for HK-style handguards
Designed for BRN-4, HK416, and MR556 builds
Recommended barrel nut torque: 50-80 ft / lbs
Upgrade or replace your BRN-4 barrel nut with the correct HK-style part from Brownells for a proper handguard fit and dependable installation.
