A PUBG streamer made a hilarious video titled "Put It Back," which is based on PUBG Corp's decision to place the M249 on the map and not in crates. It's simply a montage of BigStinkyFeet destroying opponents rather easily with the M249.
While the stats and damage of the gun hasn't changed, the increase of availability has made the gun problematic. Suddenly, the meta has swapped and you need to find this weapon as soon as possible if you want a chance at a chicken dinner.
In one clip, StinkyFeet unloads on an enemy player in a glider, making short work of him and showing off the spray, rate of fire, and magazine size in one short video. In other spots of the video, he destroys cars, takes out enemies in close and long range battles, and basically annihilates enemies.
There doesn't seem to be a battle in which the M249 doesn't win unless it's a sniper dual. You can expect the Kar-98 to win, but if you're using a rifle, the M249 will end up winning. Other crate weapons can out dual the M249, but you need to find one first.
In other words, PUT IT BACK.