5KU B-31C Upper Handguard for AK - Black
5KU CNC Upper Handguard B-31C for AK / AKM ā Extended RIS Rail System
Take your AK build to the next level with the 5KU CNC Upper Handguard B-31C, a premium upgrade designed to replace the standard gas tube cover with a full-length 20mm RIS rail. Built specifically for AK / AKM AEG and GBBR rifles with the B-30 lower handguard, this extended upper rail provides maximum space for optics and tactical accessories.
Machined from CNC aluminum, the B-31C delivers a perfect balance of strength, precision, and lightweight performance. Its extended profile ensures a stable and continuous rail platform, ideal for mounting red dots, magnifiers, or other accessories while maintaining proper rifle balance.
Key Features
- CNC-machined aluminum construction for durability and precise fit
- Integrated 20mm RIS top rail for optics and accessories
- Extended length design for maximum mounting space
- Lightweight build ā approx. 130g
- Compatible with B-30 lower handguard
- Perfect for modern AK tactical builds
Maximum Optic Stability & Modularity
The B-31C upper handguard is engineered for players who demand enhanced aiming performance and customization. When paired with the B-30 lower handguard, it creates a rigid, full-length rail system, improving sight alignment and allowing the use of advanced optic setups.
This configuration is ideal for CQB and outdoor engagements, offering faster target acquisition and improved shooting consistency. The aluminum construction reduces front-end weight compared to steel parts, ensuring better handling and reduced fatigue during extended gameplay.
Pair it with optics from our red dots and scopes collection or explore more upgrades in our external parts. Discover compatible platforms in our airsoft rifles collection.
For a complete setup, combine it with the B-30 lower handguard available in our external parts range.
Package Includes
- 5KU CNC Upper Handguard B-31C
Specifications
| Brand | 5KU |
| Product Type | AK upper handguard / gas tube cover |
| Compatibility | AK / AKM with B-30 lower handguard |
| Material | CNC-machined aluminum |
| Color | Black |
| Length | 195 mm |
| Weight | 130 g |
| Rail System | 20 mm RIS (top rail) |
| Compatibility Note | Requires B-30 lower handguard |
| Body Material | Metal |
Product Information
Product Information
Shipping & Returns
Shipping & Returns


5KU B-31C Upper Handguard for AK - Black
5KU B-31C Upper Handguard for AK - Black
5KU CNC Upper Handguard B-31C for AK / AKM ā Extended RIS Rail System
Take your AK build to the next level with the 5KU CNC Upper Handguard B-31C, a premium upgrade designed to replace the standard gas tube cover with a full-length 20mm RIS rail. Built specifically for AK / AKM AEG and GBBR rifles with the B-30 lower handguard, this extended upper rail provides maximum space for optics and tactical accessories.
Machined from CNC aluminum, the B-31C delivers a perfect balance of strength, precision, and lightweight performance. Its extended profile ensures a stable and continuous rail platform, ideal for mounting red dots, magnifiers, or other accessories while maintaining proper rifle balance.
Key Features
- CNC-machined aluminum construction for durability and precise fit
- Integrated 20mm RIS top rail for optics and accessories
- Extended length design for maximum mounting space
- Lightweight build ā approx. 130g
- Compatible with B-30 lower handguard
- Perfect for modern AK tactical builds
Maximum Optic Stability & Modularity
The B-31C upper handguard is engineered for players who demand enhanced aiming performance and customization. When paired with the B-30 lower handguard, it creates a rigid, full-length rail system, improving sight alignment and allowing the use of advanced optic setups.
This configuration is ideal for CQB and outdoor engagements, offering faster target acquisition and improved shooting consistency. The aluminum construction reduces front-end weight compared to steel parts, ensuring better handling and reduced fatigue during extended gameplay.
Pair it with optics from our red dots and scopes collection or explore more upgrades in our external parts. Discover compatible platforms in our airsoft rifles collection.
For a complete setup, combine it with the B-30 lower handguard available in our external parts range.
Package Includes
- 5KU CNC Upper Handguard B-31C
Specifications
| Brand | 5KU |
| Product Type | AK upper handguard / gas tube cover |
| Compatibility | AK / AKM with B-30 lower handguard |
| Material | CNC-machined aluminum |
| Color | Black |
| Length | 195 mm |
| Weight | 130 g |
| Rail System | 20 mm RIS (top rail) |
| Compatibility Note | Requires B-30 lower handguard |
| Body Material | Metal |
Original: $62.87
-70%$62.87
$18.86Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
5KU CNC Upper Handguard B-31C for AK / AKM ā Extended RIS Rail System
Take your AK build to the next level with the 5KU CNC Upper Handguard B-31C, a premium upgrade designed to replace the standard gas tube cover with a full-length 20mm RIS rail. Built specifically for AK / AKM AEG and GBBR rifles with the B-30 lower handguard, this extended upper rail provides maximum space for optics and tactical accessories.
Machined from CNC aluminum, the B-31C delivers a perfect balance of strength, precision, and lightweight performance. Its extended profile ensures a stable and continuous rail platform, ideal for mounting red dots, magnifiers, or other accessories while maintaining proper rifle balance.
Key Features
- CNC-machined aluminum construction for durability and precise fit
- Integrated 20mm RIS top rail for optics and accessories
- Extended length design for maximum mounting space
- Lightweight build ā approx. 130g
- Compatible with B-30 lower handguard
- Perfect for modern AK tactical builds
Maximum Optic Stability & Modularity
The B-31C upper handguard is engineered for players who demand enhanced aiming performance and customization. When paired with the B-30 lower handguard, it creates a rigid, full-length rail system, improving sight alignment and allowing the use of advanced optic setups.
This configuration is ideal for CQB and outdoor engagements, offering faster target acquisition and improved shooting consistency. The aluminum construction reduces front-end weight compared to steel parts, ensuring better handling and reduced fatigue during extended gameplay.
Pair it with optics from our red dots and scopes collection or explore more upgrades in our external parts. Discover compatible platforms in our airsoft rifles collection.
For a complete setup, combine it with the B-30 lower handguard available in our external parts range.
Package Includes
- 5KU CNC Upper Handguard B-31C
Specifications
| Brand | 5KU |
| Product Type | AK upper handguard / gas tube cover |
| Compatibility | AK / AKM with B-30 lower handguard |
| Material | CNC-machined aluminum |
| Color | Black |
| Length | 195 mm |
| Weight | 130 g |
| Rail System | 20 mm RIS (top rail) |
| Compatibility Note | Requires B-30 lower handguard |
| Body Material | Metal |






















