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Brownells
The Brownells BRN-4 HK416-type gas block is purpose-built for 10.4" HK416 barrels, delivering the durability and precision needed in modern rifle builds. Unlike standard AR-pattern gas blocks, this billet-steel unit is engineered specifically for 416-platform barrels and cannot be substituted with conventional AR15 or M16 gas blocks—compatibility matters, and Brownells got it right for your platform.
Machined from 4140/42 steel and hardened with a black nitride finish, this gas block is built to survive hard use. The interior chamber that accepts the piston head is carefully honed and finished to eliminate machine marks, ensuring smooth cycling and reliable performance over thousands of rounds. The alignment tab at the rear seats against the barrel to guarantee consistent gas port alignment and proper gas flow every time you assemble or reassemble your rifle.
Installation requires HK416-type coil pins—standard AR hardware won't work here, so plan accordingly when you order. The gas port sizing on HK416 barrels differs from civilian AR barrels, which is why a dedicated gas block matters; this unit is matched to that specification. Whether you're building a precision rifle, upgrading an existing 416 platform, or replacing a worn component, the BRN-4 delivers the fit and finish Brownells is known for.
| Brand | Brownells |
| Model | BRN-4 HK416 Type Gas Block |
| Barrel Length | 10.4" |
| Barrel Type | HK416-type only |
| Material | 4140/42 steel |
| Finish | Black nitride |
| Fastener Type | HK416-type coil pins (required) |
| Compatibility | Not compatible with AR15, M16, or standard AR-pattern gas block journals |
No. The BRN-4 is designed exclusively for HK416-type barrels and gas block journals. Standard AR15 and M16 barrels have different gas port sizing and journal specifications, so this block will not fit or function properly on those platforms.
You'll need HK416-type coil pins for installation. Standard AR-pattern hardware is not compatible.
No. This is the 10.4" model. Brownells offers separate gas block models for 14.5" and 16" HK416 barrels; gas ports differ between barrel lengths, so you must match the block to your barrel size.
The gas block itself is included. Coil pins and any other hardware must be purchased separately.
Brownells
The Brownells BRN-4 HK416-type gas block is purpose-built for 10.4" HK416 barrels, delivering the durability and precision needed in modern rifle builds. Unlike standard AR-pattern gas blocks, this billet-steel unit is engineered specifically for 416-platform barrels and cannot be substituted with conventional AR15 or M16 gas blocks—compatibility matters, and Brownells got it right for your platform.
Machined from 4140/42 steel and hardened with a black nitride finish, this gas block is built to survive hard use. The interior chamber that accepts the piston head is carefully honed and finished to eliminate machine marks, ensuring smooth cycling and reliable performance over thousands of rounds. The alignment tab at the rear seats against the barrel to guarantee consistent gas port alignment and proper gas flow every time you assemble or reassemble your rifle.
Installation requires HK416-type coil pins—standard AR hardware won't work here, so plan accordingly when you order. The gas port sizing on HK416 barrels differs from civilian AR barrels, which is why a dedicated gas block matters; this unit is matched to that specification. Whether you're building a precision rifle, upgrading an existing 416 platform, or replacing a worn component, the BRN-4 delivers the fit and finish Brownells is known for.
| Brand | Brownells |
| Model | BRN-4 HK416 Type Gas Block |
| Barrel Length | 10.4" |
| Barrel Type | HK416-type only |
| Material | 4140/42 steel |
| Finish | Black nitride |
| Fastener Type | HK416-type coil pins (required) |
| Compatibility | Not compatible with AR15, M16, or standard AR-pattern gas block journals |
No. The BRN-4 is designed exclusively for HK416-type barrels and gas block journals. Standard AR15 and M16 barrels have different gas port sizing and journal specifications, so this block will not fit or function properly on those platforms.
You'll need HK416-type coil pins for installation. Standard AR-pattern hardware is not compatible.
No. This is the 10.4" model. Brownells offers separate gas block models for 14.5" and 16" HK416 barrels; gas ports differ between barrel lengths, so you must match the block to your barrel size.
The gas block itself is included. Coil pins and any other hardware must be purchased separately.
