I like the GPR, never have owned one, but consider them the best reproduction of a Hawken you can buy without buying one.
Original barrels would be fire-blued, with the browning coming from age.
My 2 cents worth:
- Use a cold brown on the barrel. Coloring is better, and more permanent, than using the plum brown.
- Sand the stock VERY smooth before staining.
- My favorite stock coloring is to use a Brownell's stain, first red mahogany and then a coat of walnut. Alcohol based stain is best, since it will not raise the grain. Then use a fine steel wool to bring the color up - the red will start to assert itself as you remove the walnut coloring.
- Sticking with Brownell's, get their rub-on finish. You rub it on with your finger, dipping your finger in and then rubbing in the stain. It's a good, hard, durable finish. But here's the big trick - use 600 grit wet dry paper, and wet sand the finish in between layers, using the rub-on finish as the "wet" - keep the paper wet with the finish as you sand the stock. Use real light coats when you apply the finish, and take your time. But you will find that the finish is exquisite, and you don't have to steel wool it to take the shine off.
- The poured pewter nosecap is a wonderful finishing touch, but a browned cap works, too.