The SU - 16B has the same features of the A model .
The SU - 16B has a lighter barrel , an M - 16 - type adjustable - post front sight , and a windage adjustable rear sight .
The SU - 16B has the same features of the A model , but has a lighter barrel , an M - 16 - type adjustable - post front sight , and a windage adjustable rear sight .