to get your team to shoot 203's u command them to deploy frag or he or whatever your 203 is carrying, and hopefully you wont have them with grenades and a 203 son they will then fire their 203's.AT4s they fire on their own at vehicles when u tell them to fire at will. The seal AI isnt great because when theyre right next to an enemy they dont fir but when theyre behind you they light up your back. they where much better in S1 and 2. they where usually killing half there terrorist with headshots for me.
At-4's are hard to use when you are in open maps, they are better for use in small maps. They are much more effective that way. Just sit in a hall way and wait for someone to run by and shoot that babe off!