Magpul MAG1072-BLK BSL Arm Brace - Black Polymer for HK9
- Finish-Color:
- Black
The Magpul MAG1072-BLK BSL Arm Brace for HK9 is a collapsible stabilizer designed to improve single-handed control and accuracy with HK94 and MP5-pattern pistols. Built from Magpul's proprietary polymer, this brace combines durability with lightweight handling—ideal for shooters who want a more stable platform without adding unnecessary bulk. The tool-less adjustment system lets you deploy or collapse the brace in seconds, making it practical for both range work and dynamic shooting scenarios.
Stability is where the BSL shines. The integrated QD (quick-detach) sling attachment point works seamlessly with your existing gear, while the generous lateral forearm contact area gives you a solid grip during firing. An M-LOK slot adds versatility if you want to mount a sling using alternative attachment methods. The brace maintains the clean, iconic look of the MP5 platform—no bulky aftermarket aesthetic here.
This is purpose-built hardware for shooters who know their platform and want gear that actually works. Whether you're running a dedicated range gun or a home-defense setup, the BSL bridges the gap between ergonomics and portability without compromise.
Key Features
- Collapsible design for quick deployment and compact storage
- Tool-less adjustment system for fast, field-friendly operation
- Integrated QD sling attachment for seamless gear integration
- M-LOK mounting slot for alternative sling configurations
- Proprietary polymer construction balances durability and weight
- Optimized lateral contact surface for improved single-handed stability
Specifications
| Manufacturer | Magpul |
| Model | MAG1072-BLK |
| Firearm Compatibility | HK94, MP5-pattern pistols |
| Not Compatible With | HK91/G3 pattern firearms, K-length receivers, .22LR variants |
| Color | Black |
| Material | Proprietary Magpul polymer |
| Adjustment Type | Tool-less |
| Sling Attachment | Integrated QD + M-LOK slot |
Frequently Asked Questions
Will this fit my MP5 or HK94?
Yes, the BSL is designed for HK94 and MP5-pattern pistols. It is not compatible with HK91/G3 pattern firearms, K-length receivers, or .22LR variants, so verify your specific platform before ordering.
Can I adjust this brace without tools?
Absolutely. The tool-less adjustment system means you can deploy and collapse the brace in the field without carrying any extra gear.
What sling attachment options does it have?
The brace features an integrated quick-detach (QD) sling attachment, plus an M-LOK slot if you want to mount a sling using alternative methods.
Does this improve accuracy when shooting one-handed?
The BSL is designed to enhance single-handed employment and stability. The wide lateral forearm contact area and collapsible structure help distribute recoil and improve control, making it easier to manage the firearm with one hand.

