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+1 on Endymion's suggestion.
Also, the S-System's outer barrel setup is not compatible with a standard M4 RIS setup and so, a complete swap is required.
Keep in mind, that the S-System's front end is much more valuable than a standard RIS, I wouldn't do a 1:1 swap, as I find the standard Marui RIS to be inferior (it's the wobble that kills it.)
You're better off selling the SIR as a complete S-System conversion along with the upper receiver, buying a new flat top receiver and using the left over funds to score a better RIS replica like the one that Huang is selling, or if you can afford it, a G&P solution.
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