Apparently this guy got his "Good to Go" letter from the ATF and he's selling these...they go for $320 apiece but customers are saying they work like a charm.
http://slidefiresolutions.com/Product-SSAR-15.html
I'm in no way affiliated with Slidefire Solutions or any of its subsidiaries
http://slidefiresolutions.com/Product-SSAR-15.html
I'm in no way affiliated with Slidefire Solutions or any of its subsidiaries