There are a couple of StormWerkz stock adapters and a variety of stocks which can be mounted on the 180B.
Here are a couple of sidefolding stock setups you can configure:
1) StormWerkz Ar-180B Stock Adapter, Stock Folding Mech., ACE "AKFX" Skeleton stock(available at dsgarms.com)
2) StormWerkz Ar-180B Stock Adapter, Stock Folding Mech., Universal Carbine Stock Adapter, any Ar-15 carbine
type
collapsing stock (m4, SOCOM, Magpul, Colt, Tapco, etc.).
3) StormWerkz Ar-180B Stock Adapter, Stock Folding Mech., Factory Stock Adapter, original factory stock.
For non-side folding just as above but without the Stock Folding Mechanism.
Hope this helps.
-Josh