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After a lil research, "FSS"= Fixed Sights Or Front Serrations. All gen 5 models have front serrations so it doesn't make sense to make note of it in the title. The GN basically is "Generation".

Hi Miguel, FSS = Front Slide Serrations and FS = Fixed Sights. Cheers, stay safe and enjoy!

Hi Miguel, FSS is Front Slide Serrations. GN is of no significance, it is a used as a pricing code by the vendor and should not be in the description. Stay safe & have a great day!