I'm considering buying a laser sight for a handgun. The wife shot one quite well, and I'm thinking of addingone to her house gun. I know there a couple of options, but I'm concernedthat the removable kind will not return to zero after being taken off and put back on.
Models I'm considering...

Lasermax. This replaces the recoil spring guide rod, and I'm not even sure how to adjust it for zero in the first place.

Insight M6. This slide onto an accessory rail under the barrel. Uses allen wrench for adjustment, but not sure if it would stay.

Crimson Trace Lasergrips. These should stay zeroed since they would not need to be removed for routine cleaning and maintenance of the gun.

Whatchya think?