When I couldn’t get a satisfactory sight picture with the too-wide, eighth-inch, stock front sight on my Model 640, I installed an old Model 60 barrel with its 1/10” front sight, then lowered that sight till 129gr Hydra-Shoks were all in the black at 25 yards. Very satisfying. Now, twenty years later, the light must be just so before I can adequately see those sights.
is there anything you can to do now to help see the sights better?
With age comes wisdom, and deteriorating eyesight. That 640 is still very shootable in good light, has a most excellent trigger, and looks just too cool to change barrels again. Its lightweight 642 stable mate, on the hand, had its eighth-inch front sight milled to accept an XS Sights Standard Dot Tritium front, which is very easy to see and not at all light dependent:
![[Linked Image from i.postimg.cc]](https://i.postimg.cc/kG6FMvkg/D7016-D8-C-FD53-4403-BBFD-9429-A1-B581-EB.jpg)
Please ignore the flyer. 135gr +P GDHP Short Barrel ammo is just too ‘spensive to shoot up trying for a better looking 15 yard target.
That XS front sight covers the entire black bullseye at 15 yards, and makes sighting easy: Just center that front sight on the paper, covering the black, and use your best double action trigger technique.
