Actually, it's not an AK47. It's an AK74M.
And, to answer your question, you'll probably only need to change the spring for small upgrades if it come with metal bushings.
But ask Droc or Mcguyver if it has metal bushings. I can't be completly (sp?) sure since I don't own one.
But, If it's your first gun, don't try to upgrade it. Just keep it stock until you get more experience. And, from what I heard, ICS' AK is offering good performences out of the box, so no need to upgrade it in a hurry.
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