The short answer

The Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense and the S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips are both double action revolvers. The S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips is the more affordable option, starting at $691.94 versus $984.99. On the spec sheet, the Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense is lighter (11.8 oz vs 15 oz).

Frequently asked questions

What is the difference between the Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense and the S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips?

They differ mainly in caliber (.357 Magnum vs .38 Special), model (340PD vs M642 Crimson Trace Lasergrips No Internal Lock), weight (11.8 oz vs 15 oz) and finish (Black vs STAINLESS STEEL).

Which is cheaper, the Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense or the S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips?

The S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips is currently the cheaper of the two, with a lowest listed price of $691.94 compared with $984.99 for the Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense. Dealer prices are live and can change.

Are the Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense and the S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips the same caliber?

No. The Smith & Wesson 340PD Scandium .357 Magnum DAO Revolver - Ultralight Defense is .357 Magnum and the S&W 642 Airweight .38 SPL +P Revolver with Crimson Trace Lasergrips is .38 Special.