If you're building or maintaining an HK416-pattern rifle, the Brownells BRN-4 HK416 Type Gas Block is a precision-engineered component built to handle serious use. This gas block is machined from 4140/42 billet steel and finished with hard nitride coating—designed to survive extended shooting and demanding conditions without compromising reliability. Unlike generic AR15 gas blocks, the BRN-4 is engineered specifically for 416-type barrel geometry, ensuring proper gas flow and consistent cycling.

The internal chamber is finely honed to a smooth finish, eliminating machine marks that can cause binding or sluggish piston movement. A positioning tab at the rear locks the gas block into proper alignment with your barrel every time you install it, removing guesswork from the build process. This attention to detail matters when you're running a piston-driven system where gas management directly affects function and longevity.

This model fits 14.5" to 16" HK416-type barrels. It's important to verify your barrel's port size before ordering—gas ports vary by caliber and design, and the BRN-4 must match your specific barrel configuration. Installation requires 416-type coil pins (sold separately). Not compatible with standard AR15, M16, or other non-416 gas block journals. If you're running a true 416 platform or building one, this is the gas block that belongs in your rifle.

If you're building or maintaining an HK416-pattern rifle, the Brownells BRN-4 HK416 Type Gas Block is a precision-engineered component built to handle serious use. This gas block is machined from 4140/42 billet steel and finished with hard nitride coating—designed to survive extended shooting and demanding conditions without compromising reliability. Unlike generic AR15 gas blocks, the BRN-4 is engineered specifically for 416-type barrel geometry, ensuring proper gas flow and consistent cycling.

The internal chamber is finely honed to a smooth finish, eliminating machine marks that can cause binding or sluggish piston movement. A positioning tab at the rear locks the gas block into proper alignment with your barrel every time you install it, removing guesswork from the build process. This attention to detail matters when you're running a piston-driven system where gas management directly affects function and longevity.

This model fits 14.5" to 16" HK416-type barrels. It's important to verify your barrel's port size before ordering—gas ports vary by caliber and design, and the BRN-4 must match your specific barrel configuration. Installation requires 416-type coil pins (sold separately). Not compatible with standard AR15, M16, or other non-416 gas block journals. If you're running a true 416 platform or building one, this is the gas block that belongs in your rifle.