Details:
- The M27 is a modified variant of the HK 416 made for the USMC. The slight differences are made on the internal system that allow a better automatic cycle. The M27 is supposed to replaced the M249 SAW.
- Check the HK416 photos for more detail.
- The ACOG scope that is use by the Marines on the M27 is the Trijicon 3.5x35 BAC with RMR.
- ACOG web page (link)