Heckler and Koch’s Enhanced HK416 and HK416 Buffer Spring – HK German
The HK MR556/416 buffer spring will also work with other AR-15 and M-16 rifles. It is a high-wear item and a must-have replacement part.
Compatible With:
- HK416, MR556
- HK416 A5
- HK M27
- AR15, M4 & M16
