Why in the world was the M1 nerfed?! The gun itself is still a bit decent, but taking away a unique trait from a gun makes era less varied in gun stats.
With all these nerfings and other balance changes, era might be leaning towards a more pay2win oriented game. At least based on most of the recent guns lately, the nerfings on cheaper guns are to make the expensive guns look more effective than the others. A possible theory is that a more expensive version of the M1 Carbine will follow up that will now have the ability to shoot through doors. This is like what happened with the L96A1 Sniper Rifle. (The 10k sniper) It once had the ability to shoot through very thick walls. This weapon was then nerfed to oblivion. Only the expensive sniper rifles have the ability to shoot through very thick walls. Considering the L96A1, it's price is very poorly matched up with it's stats. A balance on this weapon should be considered.
Era's balance system is changing rapidly. Balancing should be handled cautiously. It can easily lead to traumatizing the players.