Here's some of the things I did: I replaced the grips on our Colt Det. Spec. shooting it the gun would roll in the hand when using +p ammo. This is used for defense, changed to rubber & problem solved. S&W model 17 .22, had a red insert added to the front site & a white outline on the rear site , now this really helped. It came with target trigger & hammer. This work helped me with the sight picture, now years later I'm older & the sight picture is... dang eye sight. Had some problems with a Colt Goldcup, kept shooting the front sight loose/off & the rear pin that holds the rear sight on kept breaking. Replaced the front sight with a red insert Millet double stake front site & replaced the pin that holds the rear sight with a roll pin, problem solved. This was the best fix to the problem, I had it repaired several times under Colts warranty. Now that my eye sight has changed due to age, I'm looking at some other must do things. I've placed a redot on one of my S&W .22's & really like it, years ago I put a 2 1/2 power scope on my S&W model 41 for squirrel hunting, now I have to use a shooting stick due to shaking. Does the must do ever end?