Currently arming distance on all AT launchers is a somewhat crazy mashup of different values. From what I've tested:
- RPG-7 HEAT/Frag: 16-17m (IRL 5-15m, close enough)
- NLAW: 20m (same IRL, good)
- RPG-7 Tandem: 37m (like why not 30 or 40, Carl - 37!) - why in the earth for AT rocket with worst max range and most tricky handling the arming distance is worse than for any other AT launcher? Must be same as for HEAT/Frag, or at least not worse than on NLAW, IRL it's 5-15m)
- C90-SR HEAT: ~8.5m - not sure about IRL parameters, but seems to be a little bit OP to have drastically closer arming range comparing to other LATs, don't you think?
That's from a short test, not sure about other launchers. It's not just some sort of whim, it's crucial for AT kits to know the precise arming range and other technical parameters to perform in their role effectively. This info must be available in-game, as one of the weapon descriptions when you select your role.