What red dot should I put on my ruger mark 3?

Installed a Deltapoint on my 22/45 stainless. Had to mod one of the included dovetail inserts and used the 1911 mount from the kit. Sweet set up, low mounting. Doesn't have the "cowboy riding a donkey look" I'll grab a pic to post.
 
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Just had to mod one of the inserts to fit the Ruger. Didn't want to do any machining to the gun. Built up the insert with tig and machined to fit. Pretty basic operation.
 
There are a lot of options. Most of them mount on a slotted rail, though Metalbender did a really nice job fitting the Deltapoint into the rear sight dovetail. I've found that almost all red dots, even cheap ones, work fairly well. I'd suggest that you consider a few things besides the mount before you buy one.

1. Dot size

If you're going to do precise target shooting or handgun silhouette a small dot size (2 MOA) or an adjustable dot size works best. This rules out most of the mini reflex sights, but if your targets will be larger or the distance short the dot size doesn't matter so much.

2. Brightness

The dot brightness, especially with sights that have an automatic brightness sensor, is often too bright if you're shooting from the covered bays of a range. A manual brightness dial tends to work better in that situation.

3. Adjustment dials

Many sights require an allen wrench (sometimes an extremely small one like the Deltapoint) to adjust your zero. All else being equal, it's a lot easier to adjust a sight that has knobs that you can turn with your fingers. Look for a positive click from the adjustment mechanism too. Some of them, especially the cheaper sights, have a very mushy feel that make them harder to adjust easily.

4. Battery life and changing

Long battery life is good, especially if you have to dismount the sight to change it. Aimpoints seem to go forever on one battery, though they are among the most expensive sights.

5. Auto turn-off

Sooner or later you'll forget to turn off the sight when you leave the range. A sight that turns off after a period of inactivity is a great battery saver when this happens.

For the kind of shooting I do the tube-type sights work best (and the Bushnell TRS25 is a good choice for an inexpensive sight; Aimpoint if budget allows.) They generally have all or most of the features I mentioned above. Other shooters prefer reflex or mini-reflex sight because of their light weight and fast target acquisition. If you can decide what features you need in a sight it will be easier (and more satisfactory in the long run) to pick one.
 
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