Hi Kevin, if it is not in the listing, the best way to tell is to look at the manufacturer's web site >>> taurususa.com/index.php/revolvers/small-frame-revolvers/taurus-605/taurus-605-t-o-r-o-357-mag-38-spl-p-black-mate-3-00-in
This revolver will fire in both Double Action and Single Action.
Stay safe & have a great day!

I have this exact model and it is double action/ single action.

Hi Kevin and welcome. It is both a Double Action and Single Action design revolver. You can search the upc of any firearm to get a better description than Buds offers. Cheers and stay safe!

Yes, this Taurus is a DA/SA model. Check out the description below.
Introducing one of the first ever optics ready small frame revolvers, the Taurus 605 T.O.R.O. This revolver is milled at the factory to accept the optics plate designed specifically for this application. The plate itself accepts compact red dots designed for the Holosun K footprint. For example, you could take the new 605 T.O.R.O. and mount the Holosun EPS Carry on it and be ready to roll. The advantages to a red dot on a revolver are significant. Obviously, red dot sights are easier for many people to shoot. Additionally, a red dot can be zeroed to a specific grain weight or type of ammo, which wasn’t an option with a traditional fixed sight revolver.
The 605 T.O.R.O. is based on the incredibly popular Defender series from Taurus. These revolvers feature all steel construction, three inch barrels, and a replaceable front sight. The triggers are Taurus’ excellent double action/single action trigger, which
provides a smooth but fast pull in double action for serious defensive shooting.