The pistol grip on the M16 appears to be lacking the finger notch which is on the A2 but not on the A1. It is difficult to be certain from the picture. This could be an A1 with A2-style handguards. Does anyone know for certain?
That's not an M16A2. The upper seems to have no forward assist, so that means it's an M16A1 upper. The lower is an SP1-style lower. It's just like this gun:
