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Gun won't let you shoot(without good force) until the cross hairs meet the target..
http://www.nbcnews.com/technology/gadgetbox/futuristic-rifle-turns-novice-sharpshooter-1B7916613
http://www.nbcnews.com/technology/gadgetbox/futuristic-rifle-turns-novice-sharpshooter-1B7916613