For the life of me, I can't understand why anyone would want second strike capability.
Sitting on my reloading bench for the last 8 years or so is a single Federal Hydra-Shok cartridge in either .38 Sp. or .357 Mag. (can't recall which right now, and don't want to take the time to go and look.) I was shooting an S&W 586 on an indoor range, and when it went "click," I followed standard procedure for a possible hangfire; kept the gun pointed downrange for 30 second, finger off the trigger. When nothing happened, I finished out the cylinder, then kept going back to that cartridge and tried again. Click. Hangfire drill again. Dumped the cartridges, tried that one again. Same result. 10 times I tried, 10 times I got a click.
Sometimes even the highest quality ammo malfunctions. If you shoot an auto, especially in a life-or-death situation, the ONLY response you should have to a "click" is a TRB drill. What if you get a "click" on the second strike? Gonna try for third, or fourth, maybe while getting ventilated by a goblin? Not this ol' boy.
I ocassionaly carry an S&W M60, and that's the beauty of a DA revo; no "drill," just activate the trigger again onto a fresh cartridge.
Here endeth the lesson.