As the other posters have mentioned, yes there is a Surefire Responder for your 11-87.
Wayne Lagger is always a good person to deal with when it comes to Surefire products. That said you may be able to get a Responder for your 11-87 a bit more economically at
http://www.maricopatactical.com
Not affiliated, etc.
HTH,
Justin
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Justin T. Huang, Esq.
late of Kennett Square, Pennsylvania