I know this is a small sampling, and RNG is RNG, but it seems that M4 has lower drop rates for some items.
For example, I’ve been farming Road Dog for a few dozen kills on M4 without getting a Redline. I drop down to M2, to speed up the farming, and I got one on my second run at him. Same with getting a hive from Princess Tarantella, or Hex grenades from the Sky Bullies, or anything to drop from the Anointed Alpha.
I’ve farmed all of these several times with zero or 1 drop. But on M2, I seem to get them more often. Just luck and RNG or has anyone noticed this?