Multitool Mod: Grenade Launcher

Description
Throwing grenades is often not very hard. Usually they're used in pretty short ranges, and it really only needs to get close to the target, not actually hit them. Still, it would be nice to be able to launch grenades from a multitool at the same time as firing a weapon, with absolute pinpoint accuracy. That's where grenade launchers come in. While still giving a bonus to range, the big appeal of grenade launchers is they calculate flight arcs and probabilities ahead of time to compensate for various conditions, so the the launch is extremely accurate. All grenade launchers provide a bonus to hit, and use the heavy guns skill rather than distance throwing.