the best and most deadly AA gun in ofp so far:
http://ofp.gamezone.cz/index.php?showthis=57132S6M Tunguska (SA-19)
These aircraft have 2 AA guns and 8 missiles in order to blow a pilots face off. We had them in our co-op clan addons for ages, as the so called 'over-deadly' BIS shilkas proved to be shite. if you put more than 1 around the island, they will activate thier radar systems (moving radar on top) and will activate an interlink between eachother, allowing the others to see what one sees. For combined arms co-op missions, they are a must, because when there 2 or 3 at an airport, you REALLY will not go through it alive with an aircraft, even with a f18 going at 1000kph with afterburners on. This was quite good in clan missions, as we had drop infantry first to take the tunguskas out before the aircraft could come in and bomb the shit out of everything.