I picked up an FN P90 a couple of years ago for about $50 from ebay. Looks like they are down to around $30 now. It shoots 400 .12g BB at 200fps every minute. The mag holds 400 rounds so obvious math means 1 minute of continues fire. Comes with a rechargeable battery pack and charger.

There are several other varieties of the P90 ranging from $120 to $170. They can shoot a larger BB at higher fps. Check a site called Airsplat

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