If you want to duplicate that finish, DON'T SAND IT.
First, take an SOS cleaning pad, you know the are steel wool pads with strong soap embedded into them.
Soak the pad in water, to soften the soap and scrub down the stock. Don't get to aggressive or you will take off the sharp edges, which is a sure sign an amateur bubba was at work.
There's lots of the aggressive soap in the pad so just keep dipping it in water and rubbing things down. Depending on how much grease/oil/dirt is in the stock, you may need a couple of pads.
Once it looks OK, wipe it down with WET PAPER TOWELS or RAGS to get rid o any soap left in the pores or cracks. It's not corrosive so don't get worried if a bit shows up later.
The steel wool in the pads will have taken down the loose fibers on the wood and give you a relatively smooth finish, that isn't to smooth and will leave the markings and dents intact.
Set the stock beside a heat vent and let it dry for a couple of days.
After it's dried, there will likely be a few ends sticking up. Take a piece of cardboard from a corrugated box and lightly wipe the surface. When it looks good, there are a couple of things you can do.
The easiest finish to apply is Linseed Oil by itself. I like to heat it up first so it penetrates a bit better. Set it aside again to dry for a couple of days or until it's dry to the touch. Don't slather it on in thick dollops or it will take a week or more to dry. I usually mix the Boiled Linseed Oil with Alcohol or Acetone in a 50/50 proportion before rubbing it in. It penetrates better and dries faster.
If you want a really shiny finish, use 3 equal parts of BLO/Acetone or Alcohol/Spar Varnish. You may want to increase the thinner to appx 50%.
By thinning the BLO and Varnish, the coats are lighter and easier to control to get the finish you desire. If it's to shiny for your taste, take some 000000 steel wool and rub it down very lightly. This will take the shine off.
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