No, late in the production run of the 610-3's they switched to fluted cylinders, probably because they had some left over from the 6 1/2 inch version.
If I ever spot a 4 inch 610-3 with the fluted cylinder I'll buy it in a New York minute. Personally, I prefer the lighter cylinder because those flutes reduce the moment of inertia, which means they don't beat up the stop notches as quickly in rapid fire and you don't have to fight that inertia with each trigger stroke. Personally, I will never understand why the unfluted cylinders ever became so popular, from an Engineering standpoint they are just dumb.