@vinny The confusion about the Alien Grenades and the Foundry arose from the fact that there's an Alien Grenade Foundry Project that becomes available once you receive your first Alien Grenade.
In order to do so, you need to capture one of the following (with the arc thrower) a Muton (big guy), elite muton (bigger, badder guy), a sectoid commander (the small ones with mind control powers) or a heavy floater (the fellas that jump around a bunch with the jetpacks, you're currently fighting a lot of 'em.)
After you've captured any one of these, you'll receive AN Alien grenade, emphasis on the quantity. Doing the foundry project gives you unlimited alien grenades. They're a MAJOR upgrade and you guys should really capture an alien at some point.
In Summary; capture an Alien, then do foundry project, get cool boom boom.
But in order to do any of this, I believe they need to rebuild the alien containment facility to house said specimens.
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