From what I've seen on eBay, Mini Defenders based on the new anime are starting to appear. There are three sets so far and they contain a nice range of characters. In a suprising move, Knight Mercurius and Veyeate are in the same set. As for the ones based on older shows- it seems these were originally released in Japan as capsule toys. Bandai have started releasing MSiA that have missile firing gimmicks. I think the only two so far are GP02 and Wing Zero Custom. The missiles fire from the Atomic Bazooka/Twin Buster Rifle.