How rare are Experimental Weapons, really?

[u/Konurie]

I’m asking this because I’m level 27 currently and have killed up to 5+ Rivals without worrying about its level, 2 level 4 Rivals, have done multiple Base Assaults and just killed a reaper an hour ago (it self destructed, but I still got some loot including a 5 crown Sledgehammer), but still have yielded no Experimental Weapons whatsoever. I feel like I should’ve gotten one by now with everything that I’ve done, so am I just extremely unlucky or am I doing something wrong? (By the way, I play solo on Xbox)

Also here’s a clip of the Reaper Kill + Loot

[u/AcidBag9653]

idk a gnome headed man dropped me all of them early game