Unfortunately as our night vision devices have become more and more effective, they have also become more fragile to damage from recoil. The black spots in the image above are permanent damage that occurred during the firing of 5 shots of M855.
With out going into too much detail, as night vision devices been improved, the distances between some of the critical parts have gotten closer and closer. Reducing this distances has made these parts more susceptible to failure from firearm recoil. In the past it was not uncommon to see people mount night vision devices like the AN/PVS-14 on AR15s and even some 308 rifles. But now people tend to recommend against that.
Sometime I’d like to talk about selecting and using night vision, but I felt like sharing this picture now.