Requesting help with Red Dot sight on StA52+link for weapon

[E4GLEyE]

Hello fellow warriors. i made an StA52 (Helghast assault rifle from killzone 2-3) and i am done with the model but damn i cant find a good picture and i am not really skilled with editing it out. can someone help me make the red dot sight? or the iron sight from kz2? I plan to make the sniper and a shotgun also and then give the pack out to the public ... i still did not try to make sound effects but will try it.

EDIT here is the link for the StA52 http://www.mediafire.com/download.php?s3eu6hoj3ikbes2 just the model no sound or sight for it.