Yep. Comp M4. It just sat around too long with a cheapo battery inside it. Not the Aimpoint's fault.
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This is what I'd recommend. In a previous life, I was an auto mechanic, and baking soda mixed with warm water was (and is) my preferred method of cleaning up battery corrosion.
It's an effective, yet mild cleaner, which is especially useful when dealing with electronics, such as an Aimpoint.
Markm is using an Aimpoint?
The world is coming to an end. For sure.
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More than likely it is an alkaline battery, so baking soda won't neutralize it.
I just cleaned up a voltmeter in the same situation with 91% iso alcohol from Wal-Mart and a model paint brush. I cut the brush bristles short (1/4") to make them stiff. I kept alcohol on the bristles and just stabbed at the "lumps" of corrosion amongst the springs with the bristles ends until they started breaking up.
Blew the battery compartment out, cleaned the brush, put a couple of drops of CLP on the brush, dabbed a little oil where the corrosion was to give it a little corrosion resistance, and then back in business.
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It's just a loaner.... The shocking part it that there's a LaRue mount... ON MY GUN!!! :eek:
http://i210.photobucket.com/albums/b...1126111342.jpg
This is what you want: http://www.caig.com/ Get the Deoxit Gold spray and use it on a swab.
Also try a plain old pencil. Use the eraser rub off the corrosion. In this particular case you might try a spinning motion.
Pour some Pepsi of the affected areas, rinse, repeat.