I've always considered Autofire to be an inefficient mode of attack because of the reduction of OCV. This makes it problematic in using it as a machine gun which in ground combat as an area denial weapon. Here is a write up for a machine gun using Area Effect, the special effect is so many bullets are being fired anyone in a certain area will be hit multiple time.
RKA 1d6=1, AE 'r (+1), Autofire [2-3 Shots] (+1/4), [32c] (+1/4), OAF: Heavy Machine Gun (-1)
Cost 50 Points
This is a low cost design and meant for NPC soldiers who would be using it on other NPC built on 100 Points or less.