I received:
"Dear Sir or Madame
Thank you for your inquiry.
At this time Crimson Trace does not produce a Lasergrip to fit the S&W 3913. However we do get periodic requests for this model, and we are continually adding new Lasergrip models to our product line based on customer demand.
We do record "Future Model Requests" and submit our findings to our design team quarterly for review. We encourage you to add your vote to what you would like to see Crimson Trace develop in the future, please use our "Future Model Request" form located here:
Request New Laser Sight Models | Crimson Trace Laser Grips
You can bookmark our website
Crimson Trace | Laser Sight Grips for Guns and check in periodically for updates on our latest product releases. If you would like to have a copy of our latest product catalog sent to you with a copy of our "5 Things Every Handgun Owner Should Know" report, please use our Brochure Request Form found here:
Get A Crimson Trace Laser Sight Catalog | Crimson Trace Laser Grips
If we can be of any further assistance please do not hesitate to let us know!
Best regards,
Brittnie Chadwick
Crimson Trace Corporation
9780 SW Freeman Dr"
If you are interested in a laser sight by Crimson Tace for your 3913, it would not hurt to email them with that request.