When Jorge Leon invented at the age of 22 a small device that turns Glock pistols into fully automatic weapons, he said he intended it to be used for the good of society, to help the military and police in his native country of Venezuela.

But 26 years after being granted a U.S. patent for his "fire selector system," U.S. law enforcement officials say his creation is flooding the streets of American cities with these outlawed machine guns and many have fallen into the hands of teenage criminals indiscriminately using them to wreak havoc on communities both large and small.

Read more: https://abcnews.go.com/US/feelterrif...

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