Scatter-Shot is right. Also, like any technology, there are always advancements. With this unit, it just means it gets smaller. I personally liked the look of the hooded Eotech version for AA batteries. You can get those from Ebay for about $300 US (the model 512). I recommend this model for two reasons - the metal hood is useful for deflecting BB's and ASC user 'Bruce' makes a polycarbonate shield that slides perfectly under the hood to protect the front of the lens from direct hits. He makes one for the bushnell too, but the Eotech solution is more graceful.
Also, not to be a nard, but his has already been discussed in the accessories section.
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