C'mon how complicated can it be? ;-) That is a tiny chip. If it was my gun, I'd make sure the chip was not contaminated with oil or anything else, mix up a small amount of acraglas epoxy ( or a good woodworkers epoxy ) with some walnut sawdust, fill the chip, ( stain if necessary to match the stock) then let it harden, and sand with fine sandpaper mounted on a backing block to make all smooth and the same colour and contour. ( check colour after its hardened by wetting) Then after sanding I'd put a wee bit of tru oil on my forefinger and rub that on. If results weren't perfect I'd repeat the tru oil and finger.
I guess the trouble is that we don't know how small or how big the chip is!
From the picture supplied in the OP first post . https://photos.app.goo.gl/r5zaztV42wpnJWnSA Longwalkers method would be what I would be doing . as it does not appear to be to serious damage .
C'mon how complicated can it be? ;-) That is a tiny chip. If it was my gun, I'd make sure the chip was not contaminated with oil or anything else, mix up a small amount of acraglas epoxy ( or a good woodworkers epoxy ) with some walnut sawdust, fill the chip, ( stain if necessary to match the stock) then let it harden, and sand with fine sandpaper mounted on a backing block to make all smooth and the same colour and contour. ( check colour after its hardened by wetting) Then after sanding I'd put a wee bit of tru oil on my forefinger and rub that on. If results weren't perfect I'd repeat the tru oil and finger.



























