It works amazingly well. I really like it for exactly what you are looking at it for. Ability to self spot hits out past 800 yds or so. I have VG6 Gama and an Epsilon on different rifles. The M4-72 is flatter. There is significant concussion out next to the rifle, and sometimes, depending on shooting positions, I can feel it as well. That said, it is a FAST shooting, flat brake.