Sorry, forgot the stock change ??.... remove the butt pad, use a 12" 3/8" drive extrension or a couple 6" extensions with a 9/16" socket on the end, stick it in the stock bolt hole and remove the stock bolt. The forend is removed by removing the phillips head screw on the bottom of the forend, then pulling the muzzle end of the forend away from the barrel. Make sure the action is closed when you do this, or the barrel can fall from the frame.
The gray laminate may still be available for H&R, but I doubt it, wouldn't hurt to check though.
Tim