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Hi Aaron and welcome. They are configured the same. The only difference is model 40187 is on the CA Handgun Roster and model 40107 is not. Details here: - https://ruger.com/products/markIV2245/specSheets/40107.html ------------------------------------------ https://ruger.com/products/markIV2245/specSheets/40187.html ---------------------------- CA DOJ Handgun Roster here: https://oag.ca.gov/firearms/certified-handguns/search?make=151002 ---------------- Cheers and stay safe!