Send the slide to Novak's they can set you up with an adjustable rear sight. (adjustable in elevation, for windage you'll still have to drift the sight). The adjustable rear is a little higher than the stock fixed Novak on your 3913 so the front blade has to be changed too. But this is by far the easiest way to get an adjustable sight on your pistol. As a bonus they give a much improved sight picture without sacrificing durability.

If you want to wring the most accuracy you can from your 3913 you could send the whole gun, have the trigger done, a function package and the barrel re-crowned. Novak's does great work and their turn around is very fast.

The top pistol has adjustable Novak's the bottom's are stock, both have been tuned and shoot amazingly well with total reliability.

/c