Holy crap I did not know that! Was using his corrosive Mali pistol for my Axton speed run got to Bunker stage, saved, came back and the pistol has changed, has different gun parts!
Yep. All mission guns will do this. Grog. .etc. they also raise level with you. Handy for ensuring you have a decent corrosive pistol or whatever
Yeah I had a feeling it went up level, well this now makes speedrun challenge that little bit easier!
also, Fun Fact: mission guns count as a picked up/purchased gun for purposes of challenges, etc. I once dinged a level of It’s Not Easy Looting Green while doing the Marcus missions.