BattleField BadCompany 2?

Are you sure these red/orange guns aren't gold? If they're gold, that just means that the person downloaded the SpecAct Pack that kit. That is also what the "SA" means. SpectAct does nothing except unlock some more pins, and achievements/trophies.

For a launcher, I personally prefer the RPG7, but its all up to you. Probably my least favorite is the AT4.

The Gustav is an anti-infantry launcher, best against soft targets with a high velocity making it good for aircraft. It is however weak against brads and tanks unless they're on there last legs, this one is my favorite - it's best for aircraft predicting flight path and firing from the hip you can catch them out more effectively.

The RPG is a bit more powerful against tanks and armored vehicles, but slower velocity and requires more leading to the target.

The AT4 is probably my least favorite, it's probably the best against armored vehicles but I just hate the sluggishness of it, it's probably the most effective against aircraft when tagged.

not sure about the "red/orange" weapons,but when it says "you were killed by this player with MG3 SA" the "SA" just means they got a special camoflauge on their gun.it does NOT change how powerful/rate of fire/accuracy/etc,it's ONLY for looks.the most effective (from experience) "rocket launcher" is the rpg7.