Disappearing Weapons

So, I had just completed the guns of reliance mission and received the legendary weapon from the safe before heading out of town for work for a week. Hand of glory was the weapon name I think? Anyways, got on today after returning home and the gun is no longer in my inventory, weapon slot is empty where it was equipped and it’s not in my backpack. Seemed like an awesome gun and I hadn’t even gotten to use it yet…is this a common problem?