So I was playing solo and was curious and using the console commands spawned both sets of weapons. On the pistol after the round during the trader, I tried to drop one. My game sort of froze a second and I dropped both guns. Both disappeared. The bigger concern was my run speed (as a gunslinger) was impossibly fast. It was like a zooming camera. It was very weird. My intent was to try one of the two G18s but they both disappeared as soon as I dropped them.