Umm, not to rain on your parade or anything but I hope that the Airsoft gun wasn't worth much money because a 100GB hard drive is old and I wouldn't pay more than ten bucks for one, if I really wanted something that old and low in capacity. Maybe twenty if it was still new and unused. Now, if it was a 1000GB (1TB) drive, then that would be different, although those can be bought new for as low as $69.99 at Newegg.
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http://www.newegg.com/Store/Categor.....me=Hard-Drives
Just trying to look out for ya, good buddy!