Update: I've used both "Reticle Dispersion Pro" (by Champi) and Dispersion Reticle (with better reticle size only selected). Both mods gave me about 15% of games with no reticle at all. However, I was also using the "Armored Warfare (green)" crosshair mod. I removed the crosshair mod and have played 20 games with Reticle Dispersion Pro with no issues. I think there is may be a conflict between the reticle and crosshair mods, but I don't know why it only occurs 15% of the time.