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One has a safety. Not sure about the other two. I do know that you can take the model numbers and see if you can match them up at the S&W site catalog and then stare and compare for the differences.

Hi Adam and welcome. The price difference is due to number of each listing in stock. Buds prices are tied to stock level and higher stock like or similar items will be lower priced than lower stock same or similar items and vice versa. Cheers, stay safe and enjoy!

Hi Adam, 11684 does not have a thumb safety, 11687 has a thumb safety, 11676 has no thumb safety and has Tritium Night Sights. Stay safe & have a great day!

11687 thumb safety 11684 no thumb safety, 11676 no thumb safety with Night Sights (Tritium)