I don't think they ever quite figured out the tactics for Dig. Even when Ollie was on his no-kill rule, Dig was shooting people up.
Now, his gun looks specialized. Like a modified gun, that I guess might have been jury-rigged to fire non-lethal ammo. But, that's only speculation because they've never said or covered that idea with the writing.
There's some weird things that are brought up by this episode, that I hadn't even considered. Like if Curtis feels this strongly about guns, why hasn't said anything about it before, considering that Rene's main form of combat are two handguns? And if he feels that strongly about guns, where is he on the kill option? Considering Rene, Ollie, and now Dig, are dropping bodies like Frank Castle. Well, okay...not like Frank. I don't think anyone can keep up with him.
I don't know, I'm starting to wonder why there isn't more friction and debate in the team on tactics considering how strongly they all seem to feel about this issue. They all freaked out about Year One Arrow's motivation, labeling him a serial killer. But, if he's still dropping bodies, and they're there assisting him, then they're just blatant hypocrites. Though, that felt more like the writers trying to reconcile Year One with Ollie's overall superhero journey.