I've refinished mine a few times...
And it's the only wood finishing work I've
ever done.
First time, I wanted a clear black look to it. I mixed together 1 part turpentine 1 part calligraphy black ink, stained the stock with that, and gave it a few coats of acrylic. Looked okay up until I fired it and the finish melted some.
Second time, I removed all the junky finish I had on there. I sanded everything as smoothly as I could, then took a cheap gas-station cigarette lighter torch and lightly burned the edges of the wood so that I got a look that was, to say the very least,
beautiful.
You have to go slow and be patient for this, and blend as evenly as possible or else you'll burn a hole right into the wood. I then put on 4-5 thin coats of boiled linseed oil, sanded lightly, and put on one final, very thin coat. The resulting look was breathtaking--a dark color that matched the metal perfectly fading into a rich reddish-brown, with an almost artificially smooth surface.
A few moths ago, I refinished, and used way too much mahogany MinWax stain (which never fully dried, IIRC). I then slathered on a couple of coats of disgustingly thick linseed oil, and it looks atrocious now.
The finish is peeling and scratching off, and isn't even hard.
But if you do it right, it looks good. I'm going to re-do mine again, most likely the second way I described.
Or just strip it all, rough-sand it, and use spray-on truck bed liner.