probably better off putting on a rear tang if you are doing custom work. i believe there are some kits which will allow you to tap (and drill if needed) a cleaning hole to attach the tang to. after that you need to mill out the stock for the tang and give it some bedding. i have seen it described as moderate difficulty if you have the right tools. there is a bunch of info on it at the rimfire central forums. however, unless you have a complete complete custom build and are running match ammo i highly doubt it will be worth the effort. unless you have a 18"+ heavy barrel droop really wont be an issue anyways. if you want a tighter fit you can just bed the receiver and that will take out any play you have between it and the stock.
in general doing a oversized pillar install, full receiver bedding, and a rear tang install would be the thing you would do to your $1500 gun to shave the last 0.05" off of your groups.