Law Tactical AR Folding Stock Adapter - Black
<p>From the manufacturer:</p> <p>The first and only folding stock adapter compatible with AR platform rifles.</p> <p>The Law Tactical Folding Stock Adapter works with direct impingement or gas piston systems and fits A2, carbine, mil-spec or commerical buffer tube and stocks. It can be used with...
dackoutdoors.com
$218
FS
I've not made a folding AR-15 so I don't know if this is a quality part or not.