FF3 here. Check out the MaddMacs base for them.
Excellent suggestion. However, the op is looking for a "target shooting" optic. Is he looking for a red dot or actual pistol scope with traditional reticle? That Maddmacs base is so much nicer than the huge thumb screw sticking out of an otherwise svelte optic. I ordered one for my weaver rail on my Ruger MK pistol. Looks like just the ticket I was looking for. Thanks! Now, for the OP, if looking for just a paper punching scope and you don't mind the red dot, I have used the Bushnell TRS25 for years:
I recently replaced it with a Burris Fastfire III and I like the small Burris better for quicker target acquisition, which is handy for the type of shooting I do. Keep in mind, the Bushnell was very good in this respect, but the Fastfire III is quicker on target by design. For shooting static targets, this a non issue. The Bushnell has never lost zero and the battery life is great and it is more than half the price of the Burris FF III.
I personally don't want to use the rear dovetail to mount the red dot, so I use a rail. That way I can pull the red dot sight off and use the irons if need be. YMMV on that though.
Again, with this being said, it is unclear what the OP is wanting. Red dot or standard reticle pistol scope for his "target shooting"..