The grenade launcher loads by removing the barrel and inserting a new barrel into the weapon. Its like metal storm. That's also one of the reasons I gave the grenade launcher a 3-round magazine.
She really does have some refinements to make, but to answer your statement about field stripping, shes a supposed to be a solid state weapon. Basically, a weapon with very few moving parts.
Yes, I really like the reliability factor that a weapon like that offers. Also I chose three grenades because if you have 3 grenades, you can hit 3 different targets.
The reason I chose to have multiple grenades is that the weapon was designed to give the soldier the maximum amount of fire power possible. If you have 1 accurate grenade, why not have 3. This is one of the cases that I believe more is better.