well if you must,
the metal surrounding the frong landing gear needs to be one peice and smoothed so from a top view it would look a bit like an oval just flatter at the sides.
the gun on the underside is too thick aswell as the gun itself being incorrect, the hydra pods have a cylinder in the middle on your mesh it should be a rectangle connecting to the other mounts for the hydras.
the antenna on the front of the optics is too thick, the air vent under the main rotor should be slanting inwards as it starts with 2 vents.
the tail shaft looks square? it should by cylindrical at the top. i think the rotors arent at 90 degrees to eachother they should be more like 30 degrees so there close together
but as you say it is lowpoly so i cant comment on the blockyness of some areas.
ps: thats all coming from memory as ive modelled 2 of these helis before so i may have forgotten a few things