I noticed nobody else had done this so far, or at least I couldn’t find it anywhere, so I tested every possible way to interact with grenades on their spawn platforms and even on the ground, to see what causes them to remote detonate in multiplayer. I have a video of my testing and analysis for those interested in watching.
https://www.youtube.com/watch?v=BuxwSJRYGJo
But long story short, here is a list of the weapons that can set off grenades (its surprisingly short honestly):
Sidekick
Commando
Battle Rifle
Stalker Rifle
Shock Rifle
Sniper Rifle
Mangler
Ravager
This does not include grenades that are being thrown by enemy players, I have not tested that yet as my normal group of friends are on a hiatus from the game and you can’t really set up a controlled test like that in matchmaking or against bots. As you can see from the list, any weapon capable of getting a true headshot is capable of detonating grenades (not including some weapons that have a milder headshot bonus like the AR and Sentinel Beam). The one exception, and I found this interesting, is the Ravager. The Ravager is currently potentially the worst weapon in the game, but this is at least a small plus in its favor that I hadn’t considered before now.