I have a Streamlight Scorpion mounted on my AR-15, and I'm happy with it. I shoot mostly with a .22 lr conversion kit, and the light holds up well. I can't say how well it would do with lots of .223 fired with it. The Scorpion uses lithium batteries, so it's really bright, but battery life isn't the best. The only problem I've encountered is the bulb falls out of the housing sometimes, but that may be due more to user error when I replaced the bulb.
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