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Markus, the Gen II has an enlarged bolt handle and bolt and the handle does not rotate. The Gen II has a larger loading port and larger safety. Differences are detailed here : -- youtube.com/watch?v=GdfOnUg40-4

Markus, Beside all the enlarged features that James mentioned on the Gen II. Gen II also has aluminium instead of plastic accessory rail. Also has Nordic Component extended magazine tube. You pay for the upgrades. The Gen I is $800 to $900 and Gen II $1200 to $1300 on the street. This is a Gen I. The Gen II models are Models 11715 and 11721.

Gen 2 is just better so go with the updated gen 2 version. Might as well.