Here are some alternative way for grenade launcher.
First: Use the combination of mines and Incendiary smoke
1. first throw incendiary it at enemy base or where you want the mines to explode
2. take out ur mines and plant them: suggest mod mines to knife for faster planting since nexon patches it.
3. it will explode instantly, dont work on gas only on incendiary.
( Since all of u know that if mines plant on incendiary it will explode, so it acts as a grenade laucher.)
Second: Tired of pulling the freaking pin of the grenade? Try modding one yourself. If you know how to cross mod, cross mod grenade(any type) to mines, it will shoot straight up( it wont plant like mines, it is actually launching the grenade. pretty awesome) .