I've tried any number of combos in my Corvette's weaponry. Started w/ an all MC HICAP magazine load-out which gave no heat issues and was good on all kind of NPC's.
W/ the HICAP option, it could stay in a CZ forever w/ ammo synthesis. The only limiting factor was the number of shield cell re-loads or if you get tired of farming.
I then tried a combo of 4C MC's and pulse lasers, it worked, just took longer time to kill. Not as satisfying.
I've settled on my last build, 2 4C HICAP MC gimballed, 2 2F HICAP MC turrets, 1 3B PA and 2 1D rails.
This last build is not as effective on smaller targets as an all MC build, but good enough, but it is murder on the big ships.
The small rails really hit much harder that any other weapon I've used there and in combo w/ the 3B PA, they eat up a ship after shields come down.
There are some quirks, the rails and PA are fixed so they have to be assigned to a secondary trigger. The PA fires off first, then there is a delay and the rails go off, they also have different trajectories.
The Corvette is heat tolerant but w/ rails you can't hold down the trigger after firing, you'll heat up fast if you do.
It takes some getting used to but I enjoy it. The different weapons also add some colors and effects that other builds didn't so there is visual excitement.
Once one has run the Corvette for a while and gotten the top mods, one can take on high rated NPC wings of Anacondas, Vultures and they don't stand a chance.
One last point, I fly in Open 99% of the time and my rig gives me a chance one on one and in a wing as support can put out significant damage.