Pitting is rare on new guns, plastic buildup and fouling is more likely.
Lots of ways to lessen and/or remove fouling. Here's a couple...
SLIP 2000, a newer gun cleaner/lube/protectant, will build up a coating in your bbl which makes the plastic less likely to buildup and easier to remove. This takes a while.
4/0 steel wool, as used in fine furniture refinishing, works on bores when used on a brush, or wrapped around a dowel and pushed up and down the bore. Chucked up in a variable speed drill, the dowel and steel wool gives a 30 second clean, no matter how much stuff has built up in the bore. Keep the revs low on that last. It also polishes a bit.
Scotch pads, as used in the kitchen sink, also work well for degrunge duty. Lube with SLIP, CLP or oil after either of these treatments.
Running a Boresnake through right after shooting will ease cleaning, getting the suff out while still semi pliable.
HTH....