Well, if you want to have longer reach you can replace your existing spring with a stronger one (which may also require bigger batteries). And then, you would also need a longer and tighter inner barrel (which will also require a new cylinder whose length is proportionate to your new barrel's length).
Then there's the issue of compression. Depending on what brand your M4 RIS is -- you may need ported piston heads, air seal nozzle, a more snug O-ring, spring guides with bearing to relieve the twisting on springs during compressions, type-1 or -2 cylinder, etc., etc.
That's just what I can come up right now. Most good brands have these sorted out already and you may only need a stronger spring, but really depends more on what's inside your gear box.
For example, you can't put in a stronger spring in there unless you have metal bushings already.
My advise is let someone who knows about this stuff have a look at your AEG.


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