Gun Controls:
U = Suppressor
R - Reload
Right MB - Aim down sights
Left MB - Fire
N - Nightvision (if wearing a helmet)
J - Flashlight
H - Green Laser (only on night vision)
M - Check ammo
General Controls:
Q - Lean Left
E - Lean Right
C - Crouch > Prone
X - Un-crouch/prone
Z - Silent walk
G - Open Door
Shift - Sprint (works with gun out too)