The M16-9mm properly set up and controlled by someone skilled in full auto fire is a sweet pup. The light felt recoil of the MP5 fools a lot of first time users into thinking that low felt recoil means it is on target. Felt recoil and a straight back push does not mean the muzzle has risen and put you off target.
http://myweb.cableone.net/uziforme/m16-9mm.wmv