Back in the halcyon days of my youth, pump guns came with round forearm wood, oft with simple rings lathed in for gripping. That's a coontail/ corncob forearm. You might note that double guns of this period oft had splinter forends.
The wood of nowadays is conformed differently, supposedly to aid ergonomics but oft only cosmetic. I see no difference in handling, and prefer the simpler lines of the old style.