I was carrying a Blaze. I found a Winchester M70. I unloaded the Blaze and discarded it onto the ground, inside of a house. I took the M70 into my hands, loaded it and assigned it to a quickbar space.
Approximately fifteen minutes later, I noticed that the M70 was gone, and the Blaze had taken its place. The Blaze was on my shoulder, unloaded and it was assigned to the quickbar space, where the M70 had been assigned.