the specified brands are the turkish guns, rete, ecol, sunak and blow.he national crime agency say they've been used in at least four killings in the uk in the last two years. tests on the weapons found they can be easily converted to fire live ammunition using common diy tools and without the need for specialist skills. therefore, they're illegal under the firearms act. detective chief superintendent peter henrick is head of the national ballistics intelligence service. >> and this is an example of another one you can purchase, which is again a top venting blank firearm. you cannot discharge a projectile. however, after the criminals have converted this is the same the same gun converted. you can still see the blue pattern of this, but now it's capable of shooting a projectile and causing injury and death. >> an amnesty for owners of the weapons is taking place until the 28th of february, meaning they can be handed in without they can be handed in without the risk of prosecution. however, possession of one of the guns after this period could mean a pris