It really depends on what part you are talking about. If you are wanting a gun that is going to have alot more configurations with parts you should opt for a Gen 3, although I am sure Gen 4 is on its way to having equally as many parts and such online, you will find the Gen 3 as of now with more compatible parts available at gun shops, online, etc.
As far as Gen 3 and Gen 4 parts being compatible themselves, some parts are, some are not...


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