Working in an office with Nerf guns at every other desk has prompted me to get my own.  Working on a board game that's inspired from Modern Warfare 2 and Borderlands has only deepened my craving for guns with interchangeable bits and pieces.  I've gotten familiar with some light mods to raise performance a smidgen, but all in all I'm just having a blast messing with the things.
 
I got the scope attachment, which turned out to be a plastic tube with crosshairs at one end and no magnification at all.  I'm tempted to switch out one of the lenses or put my pocket scope inside it to actually make it functional, but I'm not certain what I'll need to get that done.  Anyone ever messed with modding Nerf guns and their accessories?