I thought it looked like it would kill the wrists too but there’s a video of it being shot full and simi auto and it seemed pretty tame, I’ve seen worse from actually pistols and this is basically a AR conversion to classify it as a machine pistol
https://bethesda.net/en/mods/fallout4/mod-detail/4034215 This is the under-barrel launcher but it's only out for Bethesda.net on Xbox one for some reason. Hope this helps in some way.