LET'S GOOO!
Maybe these will help:
https://assetstore.unity.com/packages/3d/props/guns/m4a1-pbr-85713
https://assetstore.unity.com/packages/3d/props/guns/modern-weapons-pack-14233
M4A1 irl:
1 shot headshot, 2 body/torso shots, or 3-4 shots to the arms and legs to kill a person. It has almost no recoil, and a 150m range. Hope this helps!
Headshot: 100 damage
Torso shot: 52 damage
Legs/arms: 30-40 damage