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You can buy the HK416 RIS handguard from Huang and while people here make a good point about the M15's flat-top receiver rails not lining up with the HK416 rails I believe you can screw off the flat-top rails on your M15A4 and install ones with the appropriate height. I'm unable to check mine right now, but when I got my Hk416 I remember the top rails had a little wobble and I had to tighten the screw from the inside. I don’t have much knowledge about the CA M15A4 (even though a friend of mine had a few), but if the top rails can’t be taken off then you can always look for a Hk416 upper receiver instead.
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