After reading the description of Heavy Blaster Rifles, I feel that it doesn't match the mechanics portrayal of the weapon. Unless I'm reading it incorrectly, this blaster is a semi-automatic weapon with high damage output. Therefore, wouldn't accuracy or pierce make more sense on the weapon than auto fire.

Now someone will likely say that DLT 19 and RT90c are heavy blaster rifles and they are fully automatic. It should be noted that this game uses the old portrayal of the weapons in which the aforementioned weapons are more like the T 21 in Battlefront, and the T 21 is like the DLT 19 in Battlefront.

Am I missing something? And if not what ability would be a fair balance for autofire on this weapon: pierce 2? Accurate 1?

Battlefront is a different game that interprets things differently to fit it's different game mechanics and style as a first person shooter. Comparing one game to another is a slippery slope. Where do you stop? Do you have to also reconcile the weapons of the TIE Phantom to match Rebel Assault II? What about the Ghtroc 720? Should it be matched to the original WEG stats? Should the Snowspeeder auto-kill AT-ATs with tow cables because they could in ESB for the NES?

That said, the long description in the core book does state that heavy blaster rifles can fire busts as well as single shots. So autofire is fine... Well as fine as autofire ever is.