As my in-game bind says:
''IF IT DOES NOT SHOOT BULLETS OR SMOKE, ITS FORBIDDEN''
And now onto perks:
BLUE
Allowed:
Bomb squad
Bandolier
Recommended at all times:
Bandolier
RED
Allowed:
Stopping power
Sleight of hand
Double tap
Recommended at all times:
Stopping power
Green
Allowed:
Extreme conditioning
Steady aim
Deep impact
Recommended at all times:
Steady aim/extreme conditioning
Recommended guns:
SMG:
MP5
AKU
P90 (Yes -.-)
AR:
AK47
Sniper:
M40
NOT recommended guns:
SMG:
Scorpion
Mini-uzi
AR:
All except AK
Shotguns: All
Snipers:
Semi auto's.