A non-spinning projectile that is self-guided to a laser designated target and is configured to be fired from a small caliber smooth bore gun barrel has an optical sensor mounted in the nose of the projectile, a counterbalancing mass portion near the fore end of the projectile and a hollow tapered body...http://www.google.com.tw/patents/US7781709?utm_source=gb-gplus-sharePatent US7781709 - Small caliber guided projectile
