From what I read, I don't believe he meant that the guns or EC would be dropped from their own in inventory, but just something like a reward.
However, I don't think that EC should be rewarded... EC = Event Coin which is really just meant to be given for winning events, not PKing... As for the gun, I don't really like that idea... Possibly you could get points from PKing. If you save enough points, you could purchase a type of PK enhancement, or just fun items.