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Hi Kyle and welcome. Model 164194 has the ILS - "Internal Lock System" that many do not prefer. Cheers, stay safe and enjoy!

Hi Kyle, I cannot find any difference in the 2 guns. They both have the Internal Lock System. My guess is that 13920 is an older discontinued version. If there is any difference in the 2, it is not noticeable. Stay safe & have a great day!

nothing that I could find I suggest you contact S&W for a more accurate answer Telephone: (USA) 1-800-331-0852 Monday-Friday 8:00AM-4:45PM EST