Heckler & Koch presents the HK MR556 Upper Receiver Kit, a testament to precision engineering and superior design. This kit features a complete upper receiver/barrel assembly with a 16.5-inch cold-hammer forged barrel, ensuring durability and accuracy. The extended convertible charging handle and HK Free Floating Rail System handguard enhance functionality and ease of use.

Ideal for range time and training, the MR556 Upper Receiver Kit allows most high-quality 5.56 mm AR-style rifles to be retrofitted to HK's pusher rod system. Known for innovation, Heckler & Koch continues to set the standard in firearm accessories.

Key Features:
- Manufacturer: Heckler & Koch
- Model: MR556 Upper Receiver Kit
- Product Type: Upper Receiver Kit
- Mounting System: Free Floating Rail System
- Barrel Length: 16.5"
- Unique Features: Tungsten Filled HK Proprietary Buffer, Convertible Charging Handle
- What's In The Box: Complete Upper Receiver/Barrel Assembly, Bolt Carrier Assembly, Buffer, Buffer Spring