That's a great shooter you picked up there!
The grips are genuine India Sambar Stag antler, and they're antler bone, not horn. So they're very tough, tougher than wood and horn, and much tougher than Ivory or mother of pearl.
Deer, elk, moose, caribou, India Stag, European Red Stag, etc., are antler bone and they are shed every year. The animal does not have to be killed to harvest them. Erroneously called buck horn and horns.
Horn is made of cuticle material like antelope, rhino, bison, water buffalo, cow, sheep, etc., and they are not shed.