Hi! I'm new here new to Airsoft but I am eager to get into the sport. Anyway, I am thinking of adding a grenade launcher to my loadout. I am going for a practical, CQB-Assault loadout with a G&G M4 Fighting Cat and Colt 1911 from Evike. The M4 has a bottom rail, so should I get an under barrel grenade launcher, or a separate gun? None at all? Thanks in advance!