Developed with attention to component fit and workflow efficiency, the Heckler & Koch Upper Receiver Kit MR556 A4 11" supports smooth handling and consistent mechanical behavior. This kit is ideal for range training and recreational shooting, offering elite-level performance in a compact, suppressor-ready platform. Heckler & Koch is renowned for their ongoing product development and innovation.

Key Features:
- Manufacturer: Heckler & Koch
- Model: MR556 A4
- Caliber: 5.56 NATO
- Condition: New
- Action: Piston-driven
- Finish Color: Anodized Black
- Barrel Length: 11"
- Number of Magazines: Not applicable
- Capacity: Not applicable
- Optic Footprint: Picatinny Rail
- Unique Features: Adjustable gas regulator, M-LOK handguard
- Night Sights: No
- External Safety: No
- Threaded Barrel: Yes
- What's In The Box: Bolt carrier group, charging handle, buffer weight, buffer spring
- Weight: 6.20 lb
- Length: 17 in.
- Width: 3.07 in.