The BIG problems ; 1. Identifying the Islamist extremist, or ANY extremist for that matter !
2. Keeping this weapon out of the hands of extremists, and any American clown who takes his/her " Right to bear arms " to the extreme !
3. Americas unenviable ability to generate " Blue on Blue " casualties in EVERY theatre of war in which they become involved, imagine this weapon being unleashed upon friendly personnel !!