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Hi Gary, There's Gen1, Gen2, (NO) Gen3, Gen4 and Gen5 Glock 42's. The Gen 4 and 5 have removable backstraps and come with an extra magazine. On most the differences are the hand grips.

Gary, there's only Gen1 and Gen2. Differences are detailed here : http://looserounds.com/2014/05/10/glock-appears-to-have-made-changes-to-the-g42/

there's only Gen1 and Gen2. Differences are detailed here : http://looserounds.com/2014/05/10/glock-appears-to-have-made-changes-to-the-g42/