I'm withMike on the bedliner finish on yer stock. I refinished my MM tuned B40 stock with black bedliner. I had no choice. I'm a lefty and had to remove that RH rollover comb and make the wrist of the stock ambidextrous. After I did that, I reinforced the wrist of the stock with a BIG brass wood screw. Then I sanded it in prep for a nice tung oil finish. That's when I found the UGLY putty filled knothole in the stock. I had also accidentally knocked a small chip out of the toe of the stock. So I gave it 3 or 4 coats of Dupli Color black spray on bed liner. I hung it up in my shop for a week to cure. Cure time is important with this bed liner stuff. I waited between coats, as per the instructions on the can, and in Archer Airgun's QB78 book, but the finish was still soft after it dried for a day. After a week of cure time, it came out darned near bulletproof. Looks and feels like a nice black fiberglass stock. Great grip and weather proof.
BTW, you can change how smooth or rough the finish is by how far you hold the spray can from the stock when you spray it.
Hey, Mike. How much would a new B40 stock cost me? I'd still like one to give a nice oil finish.