Can anyone tell me about a 3913.  Is it a good gun?  Is it reliable?  Is $350 a good price for one in nice condition?

I carried a 6906 for about 10 years.  Same gun except a 12 Rd magazine.  No issues with it.  I'd take that gun for 350.

Third generation S&Ws are work horses... Size wise, I’ve heard people compare it to a Shield (single stack). Just alloy frame, DA/SA with slide safety/decocker... likely a magazine disconnect.

Downside, S&W doesn’t support them anymore.

Can’t go wrong with that price. Eventually, those guns will dry up... ones in good condition will likely go first. If you get it, stock up on magazines.

As @Screwball said, these are good little shooters. 

Outdated?  Yes

Heavy?  Yes

Magazine disconnect?  Yes

Reliable?  Yes.

350 bucks for almost any S&W is a good deal.

 

My first duty gun was a 4013 TSW - the .40 version of the 3913.

It was a pretty good gun. Low capacity and heavy though for a duty gun. 

If I ever see a 4013TSW  with the light rail  for sale, I will scoop it up.