Pandan's G36 and fa's M16A2.
NO
That is no underbarrel grenade launcher. I have both and you right click and it chucks out a grenade, as if you had thrown it.
Why an attachment is different:
- Right click to enable underbarrel grenade launcher, click to shoot
- Sticky grenade type, explodes on impact
It would also be nice to make the grenade launcher only 2 ammo, and reloading animations, if at all possible.