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Very nice.

It looks like the dispenser can replenish players through walls though as long as they are in range. I would check for visibility of players as well.
Wouldn't setting pev_owner be enough instead of using pev_iuser2 if you're just checking for the ent's owner?

You can take a look at my plugin below if you like as its pretty much very similar in concept. I'm trying to clone the armory from Natural Selection. Still a WIP and messy... Hehe.