I feel like Respawn stole my money!

Very different example - now, if caustic was changed to lets say, a female and gas was no longer the ability kit, lets say the abilities was now zipping like pathy or scanning like bloodhound, then you would have a case. The Re-45 has been nerfed and buffed a few times throughout its lifespan in this game... that is more what you are talking about. 

There is a significant difference between a fully auto pistol and a burst pistol - not even including the ramp up. complete change here, not just the gun is too strong or too weak. 

Would you have the same feeling if say the mastiff after you bought every skin for it cause you love shottys was changed to a sniper rifle? Or for all the sniper fans out there that bought every skin for the sentinal, just to have it say... changed into a sub machine gun. 

Roll with the punches? Like I said, I bought almost every single skin, every new one put out just prior to the change without any notice. Don't defend what respawn has done here. I can understand making the Re-45 weak, even changing the recoil pattern I could accept, this is a completely different gun, after they sold skins for years. There is nothing you can say to defend this.