I have never heard of these, but thought I would pass it along.
http://www.aimsurplus.com/product.aspx?item=F1AR57SL
http://www.aimsurplus.com/product.aspx?item=F1AR57SL
The FS ad mentions "low shelf". Is that semi auto only? Is high shelf the type that is RDIAS compatible? Or is low shelf RDIAS compatible?
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