No need to be confrontational. It's sound advice unless you really like spending money.

My 7-year old G&P M4A1 (my first gun ever) is still working 100% as the day I bought it and the gun has never been opened. When something breaks, I will replace it. Until then, I would just be throwing out a perfectly good working part if I changed anything.

Besides posting this in the wrong section, this also isn't the newbie tank. You should be thankful that you've received helpful responses instead of flames for being lazy.

Thanks for all the awnsers ! Sorry for posting in the wrong place im not used to forums yet :p

To echo; everyone else if it ain't broke don't fix it.

If you're looking for upgrade suggestions:

Always start with the hop rubber, I like to use firefly rubbers but there are many good ones out there.
Next thing you'll want to address is the compression. If it has good stock compression no need to change anything. No sense in upgrading something that works well to begin with.
A TB barrel may help if your stock barrel is crappy.

It all depends on what you're looking to improve on the gun. But really, when you're looking into upgrading a gun thats good to begin with you're talking about a lot of time and money for a relatively small percentage gain in performance. It's up to you if yo feel it's worth the money.