They get a small average damage boost at 1/2 range, but remain fully effective at 24".
The Psycanno was (from its ward inception, not its original hand gun form) nothing more than an assault cannon with +1S. And a firing mode that allowed it to be useable when moving. At reduced efficiency.
It should retain the assault cannons current stats, with +1S.
All it needs is a firing mode with reduced shots that negates the -1 hit penalty for moving a heavy weapon.
Not 1/2 shots as the bonus is no longer that good. You can move and fire every heavy now anyway.
Heavy 6, S7 AP-1 D1 or
Heavy 4, S7 AP-1 D1 no penalty to hit if moved
Heck Just keep it as is and bake in the no hit penalty.
Edited by Gentlemanloser, Yesterday, 10:34 PM.