Top - Beavertail forend. A broad forend, wrapping partially around the barrel(s) to give a more positive grip and to better protect the hand from hot barrels than does a splinter forend.
Bottom - Splinter forend. A slender English-style forend on a break-open gun, designed to retain the barrels on the receiver when the gun is opened and to house the ejectors---not necessarily to provide a hand-hold. Splinter forend guns are more properly grasped by the barrels just ahead of the forend. The closer one's hand is to the line of the bore and to the line of sight, the better one's coordination. Many people consider the splinter forend more graceful than a beavertail forend on a classic double gun.