AWC does make one, I believe the price on them is around $800.
Also Knights Armament makes a replacement can and according to testing is somewhere around 6db quieter than the factory HK can. I have read a post from Kevin the owner of AAC, he said something along the lines that it is one of quietest cans he has heard.
The downside is that they are not cheap, but the best never is.
Also SFCat it is RDTS (Red Dog Target Supply) not RTDS, sorry I just caught the typo.
The original can uses a rather dated baffle stack design and is a rather big pain to clean effectively. Many suppressor manufacturers will make updates and replacements. Just not a "stock" item. I'd say that this is one of the few areas where one can improve on German engineering <snap!>...
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