On an official vanilla server randomly when pointing or ads’ing the le mas rifle (in this case it’s the sawed off variant) it fires on its own until you stop aiming. I’ve had this happen at least half a dozen times before. To fix the issue I unload the gun, aim and pull the trigger a few times. This is the only weapon I’ve experienced this with. Other than occasionally wasting ammo and alerting infected and or other players to my location it’s not a huge issue.