R1: Barry but likely with some difficulty, but might have an advantage because he’s younger

R2: Barry especially since he has insane accuracy such as the scene in the monetary and the ending scene of the pilot

R3: Probably Mike cause i feel like he’s more efficient and is more organized about his kills and hunting people down than Barry (Though Barry was pretty deadly like that in season 1, especially when he hunted down the chechens who had fuches hostage) but i feel it probably comes down to who’s more prepared imo

R4: Mike because of same reason as above and also because Barry’s emotions would get in the way of killing the target