Didn’t see anything here on Easter Eggs or hunting them so not sure if its allowed yet.
I found a shotgun in one of the missions that shot shotgun shells, with forunner effects. Then end of the barrel was orange like it was on fire.
I can’t remember the mission name, but it was the first Master Chief Mission. Just before entering the hallway where master chief falls down after the pathway breaks from the hunter, i explored the area and went into a hallway and open area to the right. it was a dead end, but i did a few jump on a couple of platforms and I eventually seen a shotgun. I went for it just for the Ammo until I realized it was different. Can’t remember the name of it but it was pretty cool.