heavy weaponry penalties?

[DrakeRoberts]

Are there special rules or penalties for "Heavy Weaponry" (technological weapons like Rail Guns)? I haven't been able to locate any in the Technology Guide or online, but a post or two have made vague references that make me think I might be missing something.

Lacking exotic weapon proficiency (heavy weaponry) I would generally expect to take a -4 to use such a weapon. Are there any other penalties or rules associated with either non-proficiency or general use?

Thank you!

[CBDunkerson]

Yep, that's all there is to it. Normal non-proficiency penalty.

You can also use heavy weapons with just regular firearms proficiency if you have a Heavy Weapons Harness.