2 questions (Grand Theft Auto 5)

play sniper sometimes meet such people:
1)who can endure skorostrel or heavy...skorostrel cocet them barely, heavy need 4-5 shots, the armor on them is not worn, except Bulgarka like no drinks on Def?tried to find information in YouTube and saw this video that heavy clothing sets from the store bought-nothing has changed

this clothing
(by the way where to find a mask with goggles?)
2)these same people usually hand out a one-shot phenomenon, how, if the heavy rifle at polovom health leaves susut HP, and skorostrel and even more so, despite the fact that on his head wearing a helmet antianxiety?bullshark such characters do not accept, because able to give vansat immediately after the resa